I have just been reading some questions and answers with Jonathan from Tim O'Reilly. One that jumped out at me was a question he passed on from Jesse Stay. I'm going to quote both the question and answer below in full. The added emphasis is mine.
JesseStay : does he anticipate a fallout of original MySQL users or fork in the mysql code and how will they handle that if it does happen?
I'm not anticipating a fork - Marten Mickos (SVP, Database Group at Sun, former CEO, MySQL) made some comments saying he was considering making available certain MySQL add-ons to MySQL Enterprise subscribers only - and as I said on stage, leaders at Sun have the autonomy to do what they think is right to maximize their business value - so long as they remember their responsibility to the corporation and all of its communities (from shareholders to developers). Not just their silo.
I think Marten got some fairly direct and immediate feedback saying the idea was a bad one - and we have no plans whatever of "hiding the ball," of keeping any technology from the community. Everything Sun delivers will be freely available, via a free and open license (either GPL, LGPL or Mozilla/CDDL), to the community.
I think puts things pretty much into black and white. I wonder if we will see some egg on face retractions from those who tried to pin keeping some bits proprietary on the Sun purchase, as it looks like the opposite is actually the case. That is, the Sun purchase is what is going to ensure that these extensions are open. You know, I'm not holding my breath for any "Oops I got it wrong" type comments.