Steamroller is not being released until 2014 unless there has been some recent info that I am not aware of. In terms of gaming performance Piledriver still lags behind Sandy Bridge, but those benchmarks are mostly done with 1680x1050 resolution though. It is generally accepted that starting with 1920x1080 performance is more dependent on the GPU than the CPU so much of the performance would disappear assuming both AMD and Intel rigs are using the same GPU. But in general Intel still holds and edge especially in games that are CPU bound. On the general programs side both are or less equal to each other. AMD wins some and loses others. Same with Intel.
Will Steamroller equal the performance of Haswell? Unlikely. Will it at least be...