Steamroller should be pretty similar to Bulldozer and Piledriver. The "33% improvement" over Bulldozer mentioned in the article is probably just based on AMD's slides showing 10-15% performance/watt improvement from Bulldozer to Piledriver, and then Piledriver to Steamroller. Bulldozer is rotten in terms of performance/watt, so AMD has plenty of room for improvement. A target launch of very late 2013 or 2014 for Steamroller FX is a rather long wait considering Intel will have launched Haswell long before then and 14-nm Broadwell won't be far away.
Yes... but steamrollers still manage to crush things? Maybe the hopes of AMD fanbois?
Eh, steamrollers weren't really made to crush, they were made to plod along at a steady pace, smoothing out the road for future traffic. Let's hope that's happening, because Intel hasn't had much to worry about since the Athlon XP days, and I miss buying stuff from the underdog.