We've just received news that ATI might use a different name for the RV670 and won't call it HD 2950 after all. The RV670 might be known as Radeon HD 3000 in the future, and this will certainly push expectations even higher.
Updated: An AIB partner jumped the gun on this, and there is even a Radeon HD 3800, but our sources have confirmed that the final name has not been set yet.
As far as we know both the HD 2950 and HD 3000 names are possible.
Here's a butchered screenshot of an AIB's site.
Updated: We removed the name and the link of the AIB as AMD put huge pressure on these guys, well done DAAMIT.