Who the HELL is that turian? I don't want to freak anyone out here, but it sure as hell isn't Garrus. Oh god, where is Garrus?! OK... OK. Let's calm down for a minute. Surely there's a reasonable explanation for this. It's probably just the stand-in palette-swap turian for assholes who imported a save where Garrus was dead. Right? BioWare wouldn't pull another Grunt on us, would they? I mean, we obviously know already that Garrus is in Mass Effect 3, so there's really nothing to worry about. Let's sooth our fears by looking at the other screens.
We know that a big part of Shepard's mission in Mass Effect 3 is recruiting the various alien races to join in the fight against the reapers, so it's also possible that this mystery turian is some Palaven leader who Shepard must convince of the threat to get the turians on board. It's also reassuring that Garrus can clearly be seen in another screen, so there's really nothing to worry about.
Aug 26, 2011