I personally haven't read the new book, but from what a lot of people who have they are 1pt cheaper and spears are only a 1pt per model upgrade....
My saurus will certainly have spears. Now I'm undecided on the size of the unit, I don't think I'll go bigger than 18 with full command being 6...
Just to let you know the Bloodthirster is no longer frenzied, neither is any of the khorne deamon units anymore iirc. Obsidian armour is also a 3+...