Activision CEO Bobby Kotick has said he has doubts over whether Electronic Arts' Battlefield 3 will perform as well on consoles as the developer is promising.Speaking to CNBC over the course of E3 2011, Kotick said that only the PC version of Battlefield 3 has been shown so far, which is not where the bulk of the sales will eventually be.' Kotick told CNBC.' he added.Electronic Arts and Activision have been trading blows on the topic a lot lately, with EA's CEO John Riccitiello promising that Battlefield 3 will easily outsell Activision's Call of Duty: Modern Warfare 3. Battlefield 3's release date was announced yesterday, at E3 2011.Check out our Battlefield 3 preview or watch the trailer below to see the PC version of Battlefield 3 in action, then let us know your thoughts in the forums