More rumors were rumored at Neogaf. The post can be found here. These rumors include: 

Monster Hunter exclusive for 3DS, supports online play.
A Yoshi side scroller for 3DS, developed by Good-Feel.
New game from WarioWare team.
Etrian Odyssey 3DS
Hatsune Miku 3DS, contains all songs from Project DIVA 1 and 2.
New 3DS color: solid silver.
Presentation on eShop demos; Super Mario Land 3D will have a downloadable demo.

The "new project" from Alchemist, the famous visual novel company, is an entirely new "moe mystery" for 3DS.
Ace Attorney 5, will supposedly include an Edgeworth scenario. AA: Investigations being phased in to main series?

Do you believe them?

I want to believe.

I believe well i hope anyway.

I don't believe, but I want.

the new system color i think is true, the monster hunter game was rumored to be shown earlier in the year, but wasnt due to the earthquake in japan, i think capcom wanted too wait to see if the system sales rose or a price drop happened before the game would be announced, and since both things happened now the game should be shown off at tgs.

I'm not sure if Capcom will release a monster hunter exclusively for the 3DS, I would've thought they might of ported over Monster Hunter Tri to test the waters first

isn't it a bit soon to have a fourth 3DS colour already? and the name of it doesn't sound right at all

and I don't think Nintendo does demos, so why would they start with a title that will sell regardless? :S

I think that, given all the rumors and the things they announce, either Nintendo plans on announcing things by reading a huge list or we are gonna have a new E3 on our hands!

While the rumours sound plausable. The leak from Nintendo was supposedly that Nintendo was going to reveal the biggest 3DS title yet. Bringing out the big guns so to speak. If these rumours are all true , then Nintendo is not going to live up to the expectations of that leak. A Yoshi side scroller is not the biggest title on 3DS.

Infact its going to be pretty hard for Nintendo to put a title on 3DS bigger then OoT, MarioKart and Super Mario 3D Land. But if they can then this conference will blow Vita's TGS out of the water. Well if Nintendo can also show third party support isn't completely dead!

According to Gaf the silver color is apparently a mistranslation, they say "the original text is saying Silver Jiken 3DS, as in Grasshopper Manufacture's The Silver Case."

So, no Yoji Shinkawa decals to promote a certain stealth game, then :|