Based on upcoming toys Bandai America is planning for release in 2010, we can estimate some of the new aliens that will appear in the next Ben 10 TV series: Evolutions. Warning
: Here Be Spoilers!
These are the names of as-yet unseen alien (and bad guy) toy characters. We do not have any further information on their powers, planets etc. Stay tuned for more information when we get it.
Lodestar - Introduced in season 3, and returning in Evolutions
Nanomech (is introduced in the movie Alien Swarm, and seems to play a part in the regular series as well)