A page at MSI's website accidentally reveals details about AMD's upcoming triple and quad-core Athlon II CPUs:
All of these processors have one thing in common: they lack L3 cache, unlike their Phenom II brethren. (Even the dual-core Phenom II X2 550 carries 6MB of L3.) That omission should translate into lower clock-for-clock performance than triple- and quad-core Phenom IIs, but also lower prices. Reports from a few months back suggest that AMD may introduce these new CPUs in September.