A post by cjk (Colin Kelly of Celio) in response to a question on Palm Pre support indicates the firing order is Blackberry, WM 6.5 and then Android. Since the Blackberry is officially promised by mid Q4 that would imply none of the current beta drivers support WM 6.5 yet.
By the way they have to be really close on Blackberry and even WM 6.5 because Laurie (Celio's Director of Engineering) has offered people spots in a pre-beta release test program.
My guess is Blackberry in Nov, WM 6.5 in Dec, and Android in Q1 2010.