G92 Upgrade path

Hi there,
I'm looking at buying a new PC shortly, and will probably get a 2.4ghz Quad.
Currently I'm thinking about getting a 8800 Ultra, but I am planning to upgrade to the G92 as soon as the games start to not keep up (I'm assuming that DX10 loads will mean a shortish shelf life).
I had heard that these cards were due out at the end of the year, but will there arrival result in me having to junk my new motherboard? If I had to get a new one, would I also have to replace the CPU (or ram???)?
Also does anyone know if the G92's are likely to support DX10.1?

Or is this just the wrong time to be buying a PC, is the smart money on waiting for the new cards to come out first (I've decided that the G92's are my line in the sand, I don't want to get caught in the trap of forever waiting for the next technology that's only 3 months away).

Many thanks!

More to the point does anyone have anything concrete that the G92, or what ever its called, will be released this year?

No, you wouldn't have to.

Just make sure you get a decent dual core CPU and you'll be fine for a good while on that front.
Graphics cards are a different beast - we won't know how the current crop will perform in DX10 until UT2007 / Crysis come out (November / December). If you get an 8800GTX it will probably be able to run these games fairly well, but very well? The jury is out. And it is not even clear that whatever comes out to replace these cards will be leagues better. If I was you I would buy the best you can.

dont buy the quad unless you really really need it. They run very hot. Seriously. Core temps on an E6600 OCed to 3.2GHz are 28/29 degrees at idle. Core temps on a Q6600 with no OC are 55/48/49/54 at idle. They both jump about 18 degrees under load.