My suspicion that Sun will not continue to support PostgreSQL after purchasing MySQL was unfounded:
From Jonathan Schwartz blog::
What happens to your commitment to PostgreSQL?
It grows. The day before we announced the acquisition, and within an hour of signing the deal, I put a call into Josh Berkus, who leads our work with Postgres inside of Sun. I wanted to be as clear as I could: this transaction increases our investment in open source, and in open source databases. And increases our commitment to Postgres - and the database industry broadly. The same goes for our work with Apache Derby, and our JavaDB.
Awesome.