Even if you won't have an opportunity to tackle her on the PTR, you can still find out a fair amount about the encounter from datamining and our new friend the Dungeon Journal. We know Alizabal uses the abilities Blade Dance, Seething Hate, and Skewer. We also know she wields this thing. Good to know, that.
Brace yourselves for what could be some of most exciting updates to the game recently with patch 4.3. Review the official patch notes, and then dig into what's ahead: new item storage options, cross-realm raiding, cosmetic armor skinning and your chance to battle the mighty Deathwing -- from astride his back!