Is there a roadmap for what is currently planned for the standard library? A lot of language choice these days comes down to what high-quality batteries are included and what will require either trusting some unknown 3rd party's github project or your own homemade version.

The first-party stuff in the pipeline is basically: https://github.com/rust-lang-nursery

Off the top of my head, Time and SIMD are the only two first-party efforts that are missing from there.

Things which will, at this rate, probably never be added -- either because there isn't a "standard" solution to these problems or because it doesn't seem worth it:

* async io

* web framework/http

* numerical hierarchies and bignums

* linear algebra / stats

* GUIs

* "human" time / calendars

Eh, considering that TCP support already exists in the standard library, I could see HTTP also being added someday if there were sufficient demand.

Bignums in general are a bit too open-ended, but I could see bigints at least being added someday.

And as for async io, I think it's the same story as with HTTP: imaginably included contingent on implementation maturity and user demand.