Zack Urlocker, Eduardo Pelegri-Llopart and Josh Berkus.
Josh gives valuable feedback within the Community track of the Integration Kickoff. Mind you, Jonathan Schwartz has reiterated Sun's support for PostgreSQL:
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.
Josh says it exactly right on his blog - Sun wants to be the leading provider of datacenters. Not just MySQL datacenters. Exactly.
From Josh Berkus's blog entry on Sun acquiring MySQL, I'd especially like to quote his item #4:
No, I will not be fighting with the MySQL staff. While the two projects compete for users sometimes, the world of database development is very small and most of us know each other. Some of us are even friends.