Can we get a final answer on aquatic creatures? 

Ok, I though all of the spore creatures were terrestrial, but I saw what I believe to be a recent demo where the player was playing the creature phase underwater (His creature had fins and could swim pretty fast), then gave his creature 3 legs and walked out onto the land.  The demo then went on to discuss the remaining phases of the game.  The video was about 30 minutes long and I believe it was secretly leaked from a an apple store.  Other highlights including the creatures jumping up and down with excitement whenever an item was purchased in the tribal stage and the player losing a war in the civilization stage but still skipping ahead to space. 208.106.104.40