The sculptor Royalt1us from the He-Man.org message boards has begun work on his follow up to Po-Lar, the evil Lava-Shark. Lava-Shark will be available in both a standard shark head style and a variant hammerhead style.

Although sculpting has yet to begin on this piece, you can follow the development/ brainstorming here.
Also, if you’re interested, Po-Lar is still available here.