Taken from the recent Game Informer article:
"As if fighting the Reapers themselves isn't bad enough, you'll also have to contend with their thralls. In Mass Effect 1 and 2, players faced enemies called Husks. These cybernetic abominations are the result of humans being implanted with Reaper technology and repurposed. Unfortunately for Shepard, the Reapers can do this with practically any species in the galaxy. From bipedal races like Turians and Batarians to more beastly variations like Rachni and Harvesters, these twisted versions of familiar creatures comprise the bulk of the Reapers' ground forces."
I like the sound of this, and thought it was the most interesting part of the whole article. There was also a picture of a husked-out Rachni Soldier, and it looks particularly nasty. Cerberus will also be present, and somewhere there was mention of fighting a 50-foot-tall Cerberus mech...not sure how valid that is, but I'm looking forward to the gunfights in ME3.