I missed this earlier AnandTech test which is referenced from today's newest. At least, I think so.
This is a long-ish announcement piece, not a test, so we'll have to wait on that. Both the P300 and C300 use Marvell controllers, which are not widely used. The P300 is labeled as Micron, not Crucial. We'll see. The photo isn't even the P300. If it doesn't come with a SuperCap, we can conclude that Micron isn't really serious.
I will say, just having scanned the earlier piece, that anyone who even tests a database with RAID 5 has significant issues with database design and implementation. That koder kiddies will do so is no excuse.