There is nothing new coming out that I've heard of. I do suggest taking it back and buying online. You should be able to find that card for just over $100. $150 online will get you the 4850, which has the power of the 9800GTX. If you wanted to save $$$, you should have bought online during the Christmas sales.
Nvidia is rumored to re-re-release the 9 series cards with "new" GTX names. This is supposed to happen some time early this year, probably before spring ends. These aren't new cards, these are the same G92 cards that we've had all along just with new GTX names. (The 9800GT is supposed to be the GTX150.) I think real new cards from either side don't happen until summertime. I'm not fully up to date on this however.