11th generation AMD Fusion is in the roadmap for 2009, I have a 9th generation Opteron from 2005 and don't intend on upgrading until the timeframe noted above. Phenom looks like a small revision to existing AMD64 design with quick fixes like adding additional cache.
Short term it appears Penryn looks more impressive with 6MB L2 cache and support for DDR3 compared to 2MB L3 cache and 4000MHz HTT bus speed for Phenom, but the real question is whether current Intel Core or even AMD64 cores get the job done for you for the right price
Fusion concept: