Well, the PDF thing they did about the 970 has a photograph of the die and I'm way, way, way far from being an expert, but it looked to me like there's still a lot of real estate open on that die. As well, isn't the XE using the same processor hookup as Apple? If so, we don't have to wait as long as in the past, we just need to wait until they start making those cards with 970's on board, sell the house, and there we go! :-D
Just kidding, of course. There are Articia concerns as well as OS compatibility to look out for.