I am aware that it doesn't support AIM and GTalk on iPhone. My question is if there is a high likelihood that we will get that functionality on iOS version of iMessages in the future.
First, just as a pet peeve: it's 'Messages,' not 'iMessages.' iMessage is just one of the services that Messages for Mac and iOS offer.
Anyway, it's difficult to say whether Apple has plans to integrate AIM, GChat, Yahoo!, Facebook, or any other IM service from iChat into Messages for iOS.
My gut feeling is 'no,' because instant messaging and SMS, while technically similar, are not *used* in similar ways. Texts are more like short emails. IMs are kind of a whole thing all their own. They're used very differently.
The UI of Messages for iOS wouldn't be a particularly great way to carry on an IM conversation. Frankly, unless you're seated somewhere with a separate keyboard, iOS is just a pretty bad platform for instant messaging altogether. I think that's why, even though IMs are free and SMS costs money, paid SMS has remained popular in the face of the smartphone era.
And one of the biggest reasons, frankly, is that instant messaging has become something of a niche market; even in the heyday of AIM, it was never quite the sensation that SMS is today. And by far, these days, the biggest instant messaging platforms are Facebook, which has its own dedicated client that the vast majority of FB users would prefer to stick with rather than a separate Jabber implementation, and Skype, which has a long and difficult history with the flexibility of its APIs (or lack thereof).
All that being said, despite my belief that it's an unlikely turn of events, Apple may of course still do it. I've been wrong before about Apple, and will no doubt be wrong again. And, myself personally, simply for the convenience of it, I would very much like it if Messages for iOS would toss us even just a Jabber implementation our way (since, even though AIM and MSN are superior, they're far less widely used than Google Talk and FB Chat), even if it will be a niche product at best.
In the mean time, you should really check out 'Verbs.' It beats the heck of out Beejive, and I think it's a much better IM implementation than a shoehorned version of Messages could ever hope to be.
