Is it possible that they just have not had their "fluff people" write text for the test material in Unearthed Arcana? Or do they generally release more prose with their tests?
It's hard to say. Some UA releases have had a lot more flavor than this, but they were significantly smaller in scope. Releasing 1-3 subclasses or some new feats or racial options for testing is going to be a lot less to write out than a new core rulebook, even when released in stages. It wouldn't be unexpected if the full release had a more detailed "X of different worlds" section or similar things that go more to flavor than mechanics in general.
Don't you just hate it when people with dumb opinions have nice avatars?
