Yeah, I know it is early days right now but I do think that Oracle's acquisition of Sun Microsystems has not harmed MySQL.
Oracle has not done anything to get in the way of MySQL and as far as I can tell, it's basically business as normal: People are still using MySQL.
Admittedly, I have been busy at my job at Blizzard Entertainment but I really haven't seen anything which alarms me.
Besides, the forks are a good thing: It is a sign of a healthy community that there are forks which explore different development ideas. I just hope that the forks have sufficient respect for each other that they will allow code to be merged in every direction. For that reason, the few code contributions I have made for MariaDB (for example) have been all made using the BSD license, which should not prevent them from being merged into MySQL.
Personally, I would like to encourage more people to contribute code using the BSD license. I do believe that the use of the BSD license is perhaps the best decision made by Brain Aker for his Drizzle project.