So in iOS 5 there will be a new messenger app that supposed to work with not just the iPhone but the iPad and the iPod touch right? so does that mean that I can send/receive texts through only wifi on my iPhone?
But this will only work with other iphone users correct? as of now, there is no cross-platform messaging app to connect with android/blackberry users? Do you see one in the future?
No. It will use "data" as opposed to ("voice", where SMS messages are sent)... so you can sent iMessage messages whether connected via wifi or a cellular connection (3G/EDGE).
Samsung will launch a cross-platform texting app called 'Chat On' in September.