Our main goal with these two releases is to synchronize the features and behavior of the 1.x and 2.x lines, as we pledged a year ago when jQuery 2.0 was announced. Going forward, we'll try to keep the two in sync so that 1.11 and 2.1 are feature-equivalent for example.
Even though these newer jQuery releases have shed the legacy IE support baggage, there are still IE-specific fixes: IE9 focus of death.
The author has included unit tests, and the readme has plenty of examples. The jQuery portion of the project doesn't add any specific aspect-oriented enhancements to jQuery itself, it just binds to $.aop.aspect.
Backbone.Cache and Backbone.Cleanup
Naor Ye sent in some of his Backbone.js plugins. Backbone.Cache allows you to define a cache object that models and collections can use. You'll need to make your models and collections inherit from the right classes: Backbone.CachedModel and Backbone.CachedCollection provide a cacheObject property that can be used to point to a suitable object to use as a cache.
Backbone.Cleanup offers parent classes for views and Backbone.Router to help you clean and reuse nested views. A method called markCurrentView is used to set the current view, so when the view is no longer active its cleanup method will be triggered.