Knowing nintendo they will probaly start "fusing" other pokemon to make new ones since they seem to be running out. Look at chimchar, he is basically half charmander. chimCHAR. and the flame on his head is like charmander's flame on its tail.I like that, that looks kinda cute and creepy at the same time. Looks like a possible 5th gen pokemon too!
turtwig is sort of like a bulbasaur and squirtle fused. a grass turtle.