It appears that a BioWare employee released some early footage of Mass Effect: Andromeda on their personal Youtube channel, though that original seems to have disappeared. This is the internet though and quite a few people saved and re-uploaded the footage which shows a lot of environment features.
One of the main highlights of the video show the main character using a jet pack to move about the environment, and the second is the return of the Krogans. This opens the door for the Asari and Salarians at least to appear, alongside the new races that will be discovered in Andromeda. Since this is footage from an early build of the game it is likely there have been a lot of changes.