Here’s the info. on the variants for TMNT #5 from IDW.   Available on December 21, 2011.  Note how covers A & B are “reflections” of each other…pretty cool.

1. Cover A (Mateus Santolouco) - regular cover shipped in a 4:1 ratio (A:B) in a single order (i.e., if shops order only 1 copy they get Cover A; if they order 4 copies of Cover A they can then purchase one copy of Cover B)
2. Cover B (Dan Duncan) - regular cover shipped in a 4:1 ratio (A:B) in a single order (i.e., shops must order 4 copies of Cover A in order to purchase one copy of Cover B)
3. Cover RI A (Kevin Eastman) - 10 copy Retailer Incentive (i.e., shops that order 8 copies of Cover A and 2 copies of Cover B get this one free)
4. Global Conquest (Kevin Eastman) - International Edition issued to markets outside the U.S.A.