YouTube's maximum video length

So last week (or was it this week? I'm losing track of time) YouTube changed their maximal length of uploaded videos from 11 minutes to 15 minutes. This is really an improvement for all the young filmmakers who wish to publish their short films. Usually 15 minutes is the maximal length for shorts in festivals etc., so most filmmakers follow that rule.

I'm not sure what was the reason YouTube decided on 11 minutes to begin with, but I'm satisfied enough with the news to ask too many questions.