Bioware recently released a new live-action trailer for ME3 during The Walking Dead
You can find the video here
My opinion? It felt kind of... meh. It just looked like a cheap knock-off of one of the Halo: Reach live action trailers. Bioware should stick to CGI, they're much more effective with that medium.
Now in the spirit of ME3's soon to be release, I present you with a random Mass Effect 3 comic!