nVidia has some intermediate cards to go up against the 58xx cards - but they aren't really anything more than a stop gap - it looks like they will be doubling up with GX2 style cards to keep the performance edge...
GT300 looks like being delayed until May 2010 - unless nVidia is blowing a smokescreen.
I've also heard rumours they might pull another 7950GX2 instead of the 212 - with DX10.1 40nm mobile parts on a desktop GX2 card - bit of an odd move but nothing substantiated.
That would be all well and good if like previously the mobile version was only marginally slower than the desktop version, however afaik the top end mobile part has only 96 sp's, compared to the desktop parts with 240 sp's, a "gx2" version, while giving dx10.1 finally, would have a grande total of 192 shaders, and lower clocks, giving less performance than a simple 260 with 192 sp's which has higher clocks.
Frankly, TSMC's 40nm process is soo incredibly poor that 4770 yields are crappy, Nvidia's original plan for GT300 appears to be a monolithic core thats even bigger than its ridiculously expensive to make GT200, which was far to expensive to compete properly in the price brackets it required to make profits. But that was on a very good 65 and 55nm process, on a crap 40nm process its going to have a very very tough time getting a large number out the door.
EIther the GT300 has had a massive change in basic design from the "rumoured" spec, or it will be an expensive, largely unavailable pointless card. Maybe they'll release it, uber expensive, uber performance and be forced to rush some midend heavily cut down parts with a much smaller core as fast as possible, or maybe they've already done a redesign over the past year and its a far smaller core.
Either way its frankly set to be incredibly late and will have the issue of ATi having a refresh pretty much ready to spoil their launch whenever it is.
The real question is how the 2/3rd biggest manufacturing group made such a crappy process, after also screwing up and delivering 65nm so damn late(same 5-6 month delay to 40nm and it being dodgey at launch is the very same reason the 2900xt was forced to switch to 90nm, be late, and power hungry with lower clocks than it needed). WIll be nice to see Global Foundries get up and running, and Intel start producing their own discrete cards, to a certain degree there just isn't anyone that can produce gfx cards right now so TSMC have no real competition, with some competitive options they might stop screwing up all the time
just hope dx11 live's upto it's promice ie better looking games without needing to spend £10k to get it running smooth 
