Please, try to contain yourselves!
Technically, only Gyakuten Saiban 5 has been announced with no word on an international release. Capcom kept Ace Attorney Investigations 2 from us; those butts in Japan better not hold out on us again. No platform has been announced, but I'm going to take a wild guess and say it will be on 3DS.
That's just half the announcement, though. The other half is that the first three Ace Attrorney games are getting an HD release on iPod touch, iPhone, and iPad, with Android versions also planned. Again, no international word yet.