Unfortunatelly I am not a member of Wikieducator nor participating, so I cant reply these questions. Even for some of them I would like to compare, but cant do it. The Wikimania meeting could be, but the problem is that many people who are really "doing" Wikiversity will not be there. So than it would be nice to arrange also kind off web based meeting.
Back to the question if the projects should more clousely, I should ask, what kind of close cooperation do you mean? But in genral, my opinion is that Wikiversity is still JWS´s pupa and there is a need to protect its freedome. I think, any big influence can break this breakable organism. I would say, why not to work on closer cooperations between user wikies (such as wikies of schools and educational organisations) and Wikimedia Commons or Wikiveristy. So it depends on what kind of cooperation we should establish. Sometimes if you recieve a lot, you can also miss a lot.
Juan