( NOTE: Please remember everything on the PBE is tentative and subject to change. )
This PBE patch included two new skins - Championship Riven, a skin commemorating the close of Season two that will be available after the conclusion of the World Finals, and Victorious Janna, a skin awarded to players who finish season two with a gold rating or higher in ranked.
There were also a few skins in one of the client files, but no resources were present. Two of them, Dynasty Xin Zhao and Dynasty Jarvan IV, we already know about but iBlitzcrank is brand new! Hopefully we'll see a bit more of them in the near future.
Dynasty Xin Zhao
Dynasty Jarvan IV
recently announced Twisted Fate visual update, as well as a full set of updated skins, made it's way into this PBE update .
PAX Twisted Fate
Additionaly, Twisted Fate's updated voice overs feature a few new dialogue lines that trigger when he stuns his lore nemesis, Graves.