If we actually want to look at Famitsu's Most Wanted we could at least have it up to date
1. [3DS] Monster Hunter 4 Ultimate - 928 votes
2. [PS3] Persona 5 - 639 votes
3. [PS4] Final Fantasy XV - 480 votes
4. [3DS] Pokemon Omega Ruby/Alpha Sapphire - 412 votes
5. [PS3] Tales of Zestiria - 411 votes
6. [3DS] Bravely Second - 355 votes
7. [WIU] Super Smash Bros. for Wii U - 310
8. [PS4] The Evil Within - 299 votes
9. [PS4] Dragon Quest Heroes - 286 votes
10. [PS4] Kingdom Hearts III - 279 votes
11. [3DS] Final Fantasy Explorers - 242 votes
12. [PS4] Metal Gear Solid V: The Phantom Pain - 217 votes
13. [PS3] Shining Resonance - 193 votes
14. [PS4] Persona 5 - 179 votes
15. [PS3] The Last Remnant - 178 votes
16. [PSV] Persona 4: Dancing All Night - 176 votes
17. [PS3] The Evil Within - 164 votes
18. [3DS] Derby Stallion Gold - 162 votes
19. [PS4] Bloodborne - 161 votes
20. [3DS] The Great Ace Attorney - 133 votes
21. [PS4] Yakuza Zero - 126 votes
22. [WIU] The Legend of Zelda - 125 votes
23. [PS3] Dragon Quest Heroes - 117 votes
24. [3DS] PoPoLoCrois Bokujou Monogatari - 116 votes
25. [PSV] Phantasy Star Nova - 114 votes
26. [PSV] Kan Colle Kai - 113 votes
27. [PS3] Resident Evil HD - 110 votes
28. [3DS] Etrian Odyssey II Untold: The Knight of the Fafnir - 109 votes
29. [PS4] Resident Evil: Revelations 2 - 108 votes
30. [PS3] Yakuza Zero - 101 votes
While not the best chart to look at for future sales in Japan as some smaller titles can easily make the list from their dedicated fanbase I think its telling that Persona 5 is in the list twice and Xenoblade isnt in it at all but 2 WiiU games are (Smash and Zelda).
I think its quite possible that both versions of P5 outsell XCX on their own in Japan.
