Spoiler: Anakin after battle and a medkit
There was a post on MF.com with pictures from the new Ep3 book. One which I thought was very interesting and somewhat disappointing. It details what happens to Anakin at the end of the battle and afterwards where he is rescued by Palps/Sidious.
http://img.photobucket.com/albums/v225/swcgphotos/6ca2d357.jpg
It talks about how Anakin is found on a black sand bank on one of the lava rivers on Mustafar. He is plucked from that bank and placed in a medical capsule to keep him alive, while Sidious makes up a couple special potions to keep him alive.
So basically what was posted earlier on MF.com about the end of the battle between Ani and Obi, where Obi chops off Ani's legs and arm, and Anakin rolls down onto to the black sand bank and is being burned is true.
If anything, I was hoping that they would be fighting on top of a volcano, and Obi gives Ani and option, much like Vader gave Luke, only Ani says no and attacks Obi. Obi who already chopped off Ani's human arm, chops off both legs and Anakin falls to the ground near the ledge, and slides down a slope into an angled lava river, which leads down to a larger lava river at the base of the volcano. Using the powers of the dark side that Sidious taught him, he maintains himself, from being consumed while being in extreme pain and being burned alive. He ends up on a river bank where he is found and recovered by Palps.
That's how I would've liked it to go.