It's worth looking at the article on Series 9 (and the discussion that follows) on the home page at http://www.brickset.com
The picture clearly has a "Dr Jekyll-and-Mr Hyde"-type character, which would seem to fit with "Dr Splitz." the other thing that is of interest is the links in a comment (about half-way down the thread) that show some of the original artwork for the proposed design concepts for the collectible minifigures series — and it's amazing just how many of those concepts have already been made too! Incidentally, the Caesar in that list is in armour rather than in the classical senatorial toga.
Definitely worth a look!