2015? Are you sure that's not 2013?
There's a long list of cloud integration players, starting with Informatica, which has offered Informatica Cloud for years. Dell has Boomi, as noted, and then there's IBM's Cast Iron, Jitterbit, Mulesoft, and SnapLogic. I'm not sure how new the nuances teased out here might me. Will 2015 shape up as some sort of critical growth year? Maybe, but all of these players have been around for quite a while and all have grown quickly along with cloud-based apps and hybrid deployments.