Managed to get past Baleroc during testing today on Anasterian, and there's a small orb you can click after defeating him that gives you a cutscene of a bridge forming over the Sulfuron Span. Once the bridge is up, the Keep becomes accessible, so I figured I'd share some screenshots we snapped as we ran around inside.
Should have a Baleroc kill video up soon. Until then, you can see him in all his niftitude dead on the floor.
Baleroc:
http://imgur.com/d1euv.jpg
Ragnaros platform:
http://imgur.com/EmiC6.jpg
http://imgur.com/lMn8t.jpg
Sulfuron bridge:
http://imgur.com/7NKm2.jpg
Outer keep areas:
http://imgur.com/mBxoe.jpg
Inner halls:
http://imgur.com/eLa7W.jpg
http://imgur.com/fhXFk.jpg
http://imgur.com/GdHnz.jpg
http://imgur.com/1ExD6.jpg
Main area:
http://imgur.com/IUH3Z.jpg
http://imgur.com/2RMBn.jpg
http://imgur.com/CPvlx.jpg