A lot of people are mentioning that there is likely to be a further incr2ease later on, even as early as 4.1. I'll eat my hat if there is, I'm betting on this was just the polite way to keep people's hopes alive. A mitigation technique for the good news nay-sayers that want more than what they'll be offering. They very rarely outright give a hard definition of what will and wont become of the game, unless it's against their core philosophy.

I wouldn't expect more item slots than the initially promised ones sooner than later.