I’m posting for your curiosity, but also with secondary benefit of linking to these images in a bug report. Beta 12539. Images below.
In blood spec, I had a wandering plague proc in my combat log. This shouldn’t happen.
There are new battle.net options I had not noticed before.
Overlapping nameplates don’t seem to do anything differently on neutral targets like the dummys. I suspect the same occurs on hostile targets, but haven’t checked that yet. Bug likely.
Vengeance appears in my blood spellbook now. I don’t recall that being visible before. Maybe it has a new icon.
In the talent pane, a little tank or dps icon appears near each tree. I hadn’t noticed it before. Nice touch.
By the way, in Vashj’ir Harrison Jones is back as a fun new quest hub which appears after a while.
There was a bug where one of my DKs was not keeping her trained talents. I’d spec in, play for a bit, then they’d just disappear as if I was reset. Will check later if that’s still in this beta version. Others reported this in the past.