I've been waiting for some earth-shattering announcement or development, but as far as I can tell, Oracle's acquisition of MySQL via Sun isn't going to have any catastrophic effect on MySQL, either on the technical or administrative side. At least in the short term. MySQL was already a wildly successful business model, generating both a lot of revenue and a ton of leads for Sun, and no one I've seen has yet come up with a logical argument for why Oracle would want to disrupt that.
There is also the fact that Oracle had already adopted the software-is-free, pay-for-support model for smaller customers of the Oracle database, so it's not as if the MySQL model creates an new conflicts.
My guess is that they will bend over backwards to reassure the MySQL community that everything we like about MySQL will continue, while concentrating their revenue-maximization efforts on convincing a few hundreds or thousands of the very largest MySQL customers to migrate to the flagship product.
