There's no doubt in my mind that Dragon Quest 11 will be a 3DS game, but I don't know if that'll be announced at this.
Well, if they did I wouldn't expect it to actually be released for a good 3-4 years (if you're lucky), since for whatever reason Square-Enix always takes their sweet time making the latest installment of their least-changing franchise.
Now, a new Kingdom Hearts game on 3DS, though, wouldn't surprise me, since S-E's going to keep looking for a way to stall on Kingdom Hearts 3 until they finally decide what they're doing with FF vs. 13.