Well this isn't confirmed as true, but if so, wow. Sony's first party is becoming gigantic.
As for Sucker Punch, I'm actually surprised Sony haven't bought them given that this generation anyone producing hits for their platform seems to be aquired. Evolution at the start of the gen, then MM after LBP. Possibly InFamous was simply not considered big enough. Or given that SP is such a small studio, Sony are quite confident they'll remain exclusive to them.
Evolution was perhaps jumping the gun a bit. Motorstorm sold well as a launch title, and it was very impressive what Evolution accomplished in a limited time frame - especially with their engine. However since then we've seen nothing as successful from them, Pacific Rift which crawled by a million, and Apocalypse which will be lucky to do the same I think. I'm aware they do a lot of work on 3D and act somewhat as a tech/R&D team for Sony, but I'm not entirely sure if it was the wisest purchase by Sony by any means.
Anyway, this would be a good move by Sony. QD look to create very unique games that draws a lot of media attention. I think the extra support and sharing of tech will help them evolve as a studio as well.