The VSnext decision should be based on must haves. Our customers will answer that for us.
My 'must have' for VSnext can be summed up as "a fast and responsive GUI". I still stick with VS2008 because I don't like VS2010's perceived UI sluggishness (fortunately it's nowhere near as bad as Netbeans').
Oh, and the lack of indent-empty-lines a la VS2005.
You might notice that I complain about this in every thread about VS