Prehistoric update!

Will there be a Prehistoric update? Now how would this update work. First you have bioms were you go and search for a Lost World were there are Prehistoric animals like Wolly Mammoth, T. rex, Smiledon, etc. Now each animal is in their respectful biom like Trex in the Cetaceous biom, and Wolly Mammoth in a frozen biom for example. Or this can all be a new Dimension. I think this could be an amazing idea but ofcourse I would like to hear your ides aswell.