Remember how long we waited for Anna - and a lot of people STILL waiting! - after it was announced. Not realistic to expect Belle to come sooner even though there's a leaked beta version, since we saw screenshots and videos of Anna many months before it was released.
It is planned for the Q4 2011. Either if I'm expecting delays too, I'm sure Nokia will try to do anything in order to achieve this, it would be a really bad thing for them, if not...
i hope we will get belle in 4th quarter this year,
because they said in the morning chat they start with the new models in september,
so christmas business would be fine and as the community is very active,
if the bring belle in october they get all feedback for problems with belle within days and just can fix them easily to proof good service.