When will the new iMacs with the new video cards come out?

The new imacs video card sucks. If you have the answer or think you know it, please tell me, I hate having this 6yr old g4 and in a rush to buy a new comp at a reasonable price, don't tell me get the mac pro or mac mini. Mac pro is too much to start with and mac mini is too slow and very limited.|||soon very soon|||don't no