One of the questions being asked is why did MySQL sell, the cynics saying that $1billion does a lot of talking. It was rumoured that MySQL was going to go for an IPO in 2008, but that the deal from Sun was just too good to miss.
There are however may industry pundits who think that the deal will be very bad for this sector, with some suggesting that the whole thing is set up to get the MySQL product killed off in a way that avoids any problems with the European Union regulators (these guys have teeth and even US companies have to take note these days).
Whatever the reason for the purchase, it is bound to have some impact on the database world.