In addition to the mysql question, I wonder what it will mean for other open source stuff, like Java, which has been moving in that direction, Open Office, Solaris, etc... Oracle, traditionally, hasn't been a big open sourcer of things, although they were one of the first to give some real legitimacy to Linux by porting to it, some 10+ years ago.
Also, culturally, how will the fit be? Wonder if they intend to keep some of the good bits of Sun and trash the rest or try and run it as a going concern?
Big news in any case.