no i personally think they would let you keep the unlimited plan, but they may not. Eventually at some point they are probably all going to try to get people off of unlimited plans, even seems they are trying to go to tiered plans for in home broadband.Do you honestly think they would do that for the i4s/i5 in September?
If they do I'd rather get the i4 now and hold onto it for two years (with my Unlimited Plan) and hope in 2 years I could get grandfathered in for the i7 (or w/e) since I have the i4.
But then again, I think the only reason they would do that is to bump up i4 sales which is BS. I've know the guy at my Verizon store for a long time and he's always hooked it up...I'd probably see if he could hook it up again!
Technically if VZW wanted to they could not let anyone get grandfathered in and force all users to switch to a tiered data plan, if you don't like it you can leave, but they know you aren't likely to leave because you can't get unlimited on att anymore either. Hopefully they don't do that, but it's not out of the realm of possibility, that's all i'm saying.