This was discussed on IRC but it doesn't look like a code ticket was created. There is one for the docs at jquery/api.jquery.com#904 because the example in $.when() is pretty bad, but the main problem is that .done() now gets an array instead of individual args.

Repro here: http://jsbin.com/civaxelixa/edit?html,console

Marking this as a blocker for the moment.