Will people say the PS4 is selling well because of Knack whenever it stays in the charts for months.

Knack will bomb in Japan ,those games are a lot bigger then knack and they are system sellers.

Oh lookie here Sony! A big game is released and suddenly hardware gets such a nice boost and you've got yourself another 200k software soft in just one week in Japan. How about, I dunno, release more big time games and not just focus on indies or middle tier games at best!?

I really don't think so.  This time last year it was the Wii U's 4th week on sale, so it was still shiny and new, and you'd expect demand to be inflated.  This year, the drop from the begining to middle of January will be less pronounced.  DKTF is in about a month and that should keep sales from dipping too low, and then Mario Kart should probably keep it above that point for the rest of the year.  I don't think being down by about 10,000 over the system's fourth week on the market is anything to be worried about.

The 3DS will on the other hand will be down YOY.  Unless Nintendo has something really out of left field, or another new model that's not the 2DS, it's hard to see any other result.  Last year had Monster Hunter, Pokemon, still newish Animal Crossing, Zelda, Luigi's Mansion, etc.  The only really big game we have for Japan is Smash, but I'm not sure if that will really boost hardware.  Being down YOY in Japan is not the end of the world though if Nintendo can offset that with US and European sales.

From neogaf

Just a quick summary of the Vita performance in 2013:

              Week                     W/sales             LTD

Week 01, 2013 (Dec 31 - Jan 06) 31,082 1,108,241  

Week 02, 2013 (Jan 07 - Jan 13) 10,131 1,118,372

Week 03, 2013 (Jan 14 - Jan 20) 8,597 1,126,969

Week 04, 2013 (Jan 21 - Jan 27) 8,495 1,135,464

Week 05, 2013 (Jan 28 - Feb 03) 8,266 1,143,730

Week 06, 2013 (Feb 04 - Feb 10) 7,379 1,151,109

Week 07, 2013 (Feb 11 - Feb 17) 7,401 1,158,510

Week 08, 2013 (Feb 18 - Feb 24) 11,669 1,170,179

Week 09, 2013 (Feb 25 - Mar 03) 60,561 1,230,740 Price cut: ¥29,980 (3G) / ¥24,980 (Wi-Fi) > ¥19,980 (both versions). Senran Kagura Shinovi Versus released (~92k FW). PS20 package version released (~56k FW).

Week 10, 2013 (Mar 04 - Mar 10) 61,152 1,291,892 Soul Sacrifice released (~106k FW).

Week 11, 2013 (Mar 11 - Mar 17) 36,431 1,328,323 

Week 12, 2013 (Mar 18 - Mar 24) 37,883 1,366,206 One Piece: Pirate Warriors 2 released (54.5k FW).

Week 13, 2013 (Mar 25 - Mar 31) 33,605 1,399,811

Week 14, 2013 (Apr 01 - Apr 07) 19,879 1,419,690

Week 15, 2013 (Apr 08 - Apr 14) 14,755 1,434,445

Week 16, 2013 (Apr 15 - Apr 21) 14,666 1,449,111

Week 17, 2013 (Apr 22 - Apr 28) 17,070 1,466,181

Week 18, 2013 (Apr 29 - May 05) 17,855 1,484,036

Week 19, 2013 (May 06 - May 12) 12,738 1,496,774

Week 20, 2013 (May 13 - May 19) 11,564 1,508,338

Week 21, 2013 (May 20 - May 26) 13,719 1,522,057

Week 22, 2013 (May 27 - Jun 02) 12,381 1,534,438

Week 23, 2013 (Jun 03 - Jun 09) 10,100 1,544,538

Week 24, 2013 (Jun 10 - Jun 16) 11,728 1,556,266

Week 25, 2013 (Jun 17 - Jun 23) 13,002 1,569,268

Week 26, 2013 (Jun 24 - Jun 30) 34,701 1,603,969 Toukiden: The Age of Demons released (~128k).

Week 27, 2013 (Jul 01 - Jul 07) 21,197 1,625,166

Week 28, 2013 (Jul 08 - Jul 14) 15,192 1,640,358

Week 29, 2013 (Jul 15 - Jul 21) 13,685 1,654,043

Week 30, 2013 (Jul 22 - Jul 28) 17,776 1,671,819 Dragon's Crown released (75.5k FW)

Week 31, 2013 (Jul 29 - Aug 04) 17,031 1,688,850

Week 32, 2013 (Aug 05 - Aug 11) 15,755 1,704,605

Week 33, 2013 (Aug 12 - Aug 18) 21,482 1,726,087

Week 34, 2013 (Aug 19 - Aug 25) 12,928 1,739,015

Week 35, 2013 (Aug 26 - Sep 01) 9,443 1,748,458

Week 36, 2013 (Sep 02 - Sep 08) 7,427 1,755,885 Vita 2000 + Vita TV announced (Sep 9, 2013).  

Week 37, 2013 (Sep 09 - Sep 15) 6,083 1,761,968

Week 38, 2013 (Sep 16 - Sep 22) 5,306 1,767,274

Week 39, 2013 (Sep 23 - Sep 29) 6,436 1,773,710 The Legend of Heroes: Sen no Kiseki released (~94k FW).

Week 40, 2013 (Sep 30 - Oct 06) 3,670 1,777,380

Week 41, 2013 (Oct 07 - Oct 13) 58,682 1,836,062 Vita 2000 released (Oct 10, 2013). DanganRonpa 1-2 Reload released (~71k FW).

Week 42, 2013 (Oct 14 - Oct 20) 25,211 1,861,273

Week 43, 2013 (Oct 21 - Oct 27) 24,002 1,885,275

Week 44, 2013 (Oct 28 - Nov 03) 28,219 1,913,494

Week 45, 2013 (Nov 04 - Nov 10) 22,924 1,936,418

Week 46, 2013 (Nov 11 - Nov 17) 90,996 2,027,414 Vita TV released (Nov 14, 2013), 40,225 FW according to Famitsu, 42,172 according to MC. God Eater 2 released (~259k FW).

Week 47, 2013 (Nov 18 - Nov 24) 32,138 2,059,552

Week 48, 2013 (Nov 25 - Dec 01) 27,768 2,087,320

Week 49, 2013 (Dec 02 - Dec 08) 28,253 2,115,573

Week 50, 2013 (Dec 09 - Dec 15) 34,993 2,150,566

Week 51, 2013 (Dec 16 - Dec 22) 49,366 2,199,932

Week 52, 2013 (Dec 23 - Dec 29) 75,207 2,275,139 Final Fantasy X /  X-2 HD released (~135k Twin Pack / ~23k X HD / ??? X-2 HD).

*Famitsu numbers

*Vita and VitaTV sales are combined.

*Only titles with 50k+ FW mentioned.

I thought I was being blatant enough. Knack will be there because it's bundled with every PS4 in Japan. Wii Party U and NSMBU are only there because they're bundled with the vast majority of Wii Us.

Anyone updating the Media Create sales? It's already out(for Dec 23rd to 29th)

Wii u sold poorly before those bundle,that mean people buy a wii u because of those games,in the case of Knack you can't know if people buy a ps4 just  for this game or because they are interested in other games.

Dengeki for this week, for anyone interested:

Go Vita! :D