Regarding prices, the replacement Socket AM2 chips are priced the exact same as their Socket 939 predecessors in AMD's list. It wouldn't be unreasonable to expect retailers to introduce some price differences of their own, but AMD is definitely trying to smooth the transition here. As for the new models, the FX-62, X2 5000+, and X2 4000+ are priced at $1,031, $696, and $328, respectively. The FX-62 launch also dropped the price of the Socket 939 FX-60 to $827.
Finally, while AMD carried over its entire Athlon 64 X2 line to Socket AM2, the single-core Athlon 64s and Semprons have suffered some downsizing. Only the Athlon 64 3800+ and 3500+, as well as the Semprons 3000+, 3200+, and 3400+, made it to the new socket. AMD did introduce a couple of new Semprons to bridge the low-end gap, however: the Sempron 3500+ and 3600. As predicted, all new Athlon 64 and Sempron chips for Socket AM2 only bear TDPs up to 62 W, a move down from the previous 89 W rating for some single-core Athlon 64s.