Wrong, AM2 is a socket type, 939 and AM2 are NOT interchangable. Retention mechanism is different too.
Why would they call it AM2 if it was the same as 939 pin ?
Stop guessing and do some real reading.
The other unexpected aspect is that existing HSF combos that many people have enjoyed using and upgrading from socket 754, 940, and 939 models will no longer work with AM2; a new HSF will be required to cool your next-gen AMD processor. While this will be of no concern to those who buy boxed CPUs with HSF combos within, those who buy the less expensive processors at trade shows and through local shops will now have to fork over an extra US$40+ for a compatible HSF combo. Compared to the price of moving from your current 940-pin AMD64 product with DDR up to a new 940-pin AM2 product with DDR2, it should be minor.