Puma did not post screenshots of iGK.
The tileset for iGK has been cleaned up and improved on quite a bit (albeit, I would have taken a completely different approach to what was presented to us...).
As far as a mobile / PC comparison, iGK is not structured in the same way, while the characters and some images are the same, iGK is essentially a fresh start that the PC version needed because of poorly adopted systems (see: Crossfire...).
On another note, this thread was intended for the announcement of GK for Facebook, and has strayed far off topic.