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Yes, but let's be honest. Who's going to plump for tri-fire on these? The target market is those who game at 2560 x 1600, and unfortunately the performance increase over GTX 580's (at least in BF3) isn't enough to warrant it, *UNLESS* AMD price them competitively, which you've already indicated AMD aren't going to do Gibbo.
49.7fps on the 7970 versus 44fps on the GTX 580 says it all really, at least for this game. If Nvidia drop prices of GTX 580 that's going to swiftly kick AMD in the nuts, at least for people buying hardware expressly for this title anyway.
FPS comparison:-
http://www.anandtech.com/show/5261/amd-radeon-hd-7970-review/22
pretty poor tbh
Id say thats a very good score with a stock system it beats mine clocked as high as it will go by 4000