but I don't like the insertion of Radagast, the Elf-Witch, and the Necromancer. Those characters only merited fleeting references in the books. (Well, Radagast and the Necromancer anyway) To say nothing of whatever Evangeline Lilly is supposed to be doing there.
The Necromancer is an important part of the Lord of the Rings. He's made in passing reference in the Hobbit for sure, but his inclusion in the movies will be the second link to the LOTR trilogy (aside from the One Ring). The story of the necromancer is included in the appendices of the LOTR books as I recall.
I was happy to see Radagast fleshed out... not sure if I love how PJ actually fleshed him out though.