They managed to solve the 576, so solving the 640 must be within their reach.

http://www.rsasecurity.com/rsalabs/node.asp?id=2093


I also notice that the prize money has been reduced.

http://web.archive.org/web/20030208012320/www.rsasecurity.com/rsalabs/challenges/factoring/numbers.html

As of August 2003, the prizes are the same. And the whole point of RSA is that it gets exponentially harder, so it's not a sure bet that 640's within reach.