Aside from the higher clock speed—an extra 100MHz over the Athlon II X4 630's 2.8GHz—word is that the upcoming processor will retain the same basic specs. So, you can expect Propus silicon with 512KB of L2 cache per core, no L3 cache, and a 95W thermal envelope.
Right now, the Athlon II X4 630 is selling for $123, while the 2.6GHz Athlon II X4 620 is available for $99. As Fudzilla points out, the arrival of the upcoming X4 635 (if it does indeed come) could bump the X4 630 down a notch on the price ladder, bringing it to a cool $99.
If that happens, the Phenom II X3 720 could suddenly become a tougher sell. While it does have 6MB of L3 cache, it would have the same clock speed as the 630 with a missing core and a higher price tag. Such a move could also put pressure on Intel to offer its Core 2 Quad Q8200 for less than $150.