Thanks for the update! The things that Composer needs jquery/moo for are all compartmentalized into one place (called the adapter)...sounds like you guys are moving in the same direction.
I wish backbone hadn't tied itself so closely to jquery early on because I really like the project and could have seen myself building a lot on top of it (like composer's filtercollections or listcontroller), and now it seems both projects are occupying closer and closer to the same space. Who knows, this may be good though.
To be sure, Backbone has had "adapters" for a pretty long time. You just replace Backbone.$ and be on your way (there's a few for mootools, etc if you look hard enough). The latest changes just make this a bit easier so you can use native DOM / xhr methods if that's your particular bag of awesome.
I wish backbone hadn't tied itself so closely to jquery early on because I really like the project and could have seen myself building a lot on top of it (like composer's filtercollections or listcontroller), and now it seems both projects are occupying closer and closer to the same space. Who knows, this may be good though.