To my meager noobie knowledge, Mysql changed it's licensing for 4.x and therefore it can't be bundled with any new distro's (not legally anyway I guess).
As for the upgrading, I haven't found a way to just upgrade it, I did download Mysql 4.0 from mysql's website (an rpm), but haven't installed it yet. (haven't looked at any of the docs yet, I assume they say something about it)
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