Puff piece. Doesn't really say anything we haven't heard in L&L.
That's all anyone can write at this point.
Either happy fluffy "my trip to DDXP" stories about how everyone got along despite edition differences, or somewhat more grumbly stories about it how seems there's more yet to be done to make D&D Next work well but they're still glad they got in the playtest.
This goes back to the Parable of the Paladin and the Stirges -- we can't really expect anything BUT puff from the playtesters' blog posts, because the NDA prohibits them from discussing mechanics.