No plans now. One of our driving philosophies is that we truly want the language and the standard library to be stable in order to make it easy for users to upgrade when we release every 6 weeks (known as the train model). The consequence of this is that we are promising to support that anything added to the standard library. If we followed Python's "batteries included" philosophy, those libraries would be quick to atrophy as we learn better ways to implement things.
So instead we developed Cargo to make it as easy as possible to depend on external resources. There are a few projects trying to make GUIs easy to use with Rust, which you can see on Awesome Rust. I believe the most advanced integration is with GTK, but I don't have much experience in this space, so I could be wrong.