Amidst the drunkenness at the Harmonix Rock Band party, we learned that Pat Benatar's "other really popular song" is headed to Rock Band 2. If you rule out "Hit Me With Your Best Shot" (Guitar Hero 3 launch and Rock Band via DLC) and "Heartbreaker" (Guitar Hero: World Tour), that pretty much leaves "Love Is A Battlefield" as the likely contender.
Either that, or they'll go for something super obscure like "Somebody's Baby" from her 1993 "Gravity's Rainbow" album. Uh ... not that we knew that off-hand or anything.
[Update! Our drunken source was COMPLETELY WRONG! The new Rock Band song is indeed "Heartbreaker." So how about it, music gods? People are crying out for Love is a Battlefield, and a lot more Bena-tunage. What's next?]