XenForo 2.0 Preview

I think I might wait on this upgrade until everything has been fixed that might need fixing.

How does this affect the add ons then?
You must validate your XenForo license to see quoted content
It's already known fact that all add-ons will have to be rewritten for 2.0.
That alone will make the change over something to really consider doing.

So far I have not noticed any real big aspect that would make me want to change over ASAP.