Bethesda Softworks – Mystery Revealed Tomorrow

Bethesda Softworks just tweeted that a mystery game will be revealed tomorrow. They’ve been teasing Vine looping trailers all week.

You can view the official tweet below:

mystery revealed tomorrow @ign vine.co/v/bUqveJ2uFeZ
— Bethesda Softworks (@Bethblog) April 18, 2013

Any ideas as to what game this might be?