Having already learned how the Mass Effect team created Legion's voice, GameInformer now brings us an eight-minute video of Mass Effect art director Derek Watts talking about their original vision for the turians and how the alien race has evolved throughout the series. It's not until about halfway through the video that he starts covering the ideas and alterations they've made to Garrus, specifically.
Tali's face revealed in Mass Effect 3? Sounds like that just might be the case.