AMD plans two K10.5 45nm-based quad-cores and Deneb is the one with 6MB of L3 cache, but there will be a Propus core with the same specs, but without any L3 cache.

It is natural to expect that the version without L3 cache has to end up lower priced and there is a chance for it to be smaller, as well. It all depends whether AMD simply disables the L3 cache of Propus or whether it actually physically cuts it out to make this K10.5 much more affordable.  

The new Propus core will fit to existing AM2+ infrastructure and it is scheduled for the second half of 2008. Deneb and Propus are the ones that might get some faster than 2.6GHz speeds, and from what we know they should easily be able to break the 3.0GHz barrier.