No; it re-exports the standard futures. Its purpose is two-fold: one, it's where futures were experimented with before they got into std, and two, it's where extra functionality can live. We only put what was absolutely necessary into std.
Not quite. The futures crate, version 0.1, contained a definition of the `Future` trait and a bunch of the combinator methods. This was iterated on a lot. Eventually, the bare minimum traits were added to the standard library.
The futures crate, version 0.3 (released under the name `futures-preview` right now with an alpha version number), contains the helper methods for the standard library's trait.
