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> Are there any reasons besides being new and not-so-popular for that?

It has a level of flux that is astonishing (even compared to other pre-1.0 languages)... now, it could be argued that this is how a pre-1.0 should be, but it makes it very hard to build any serious project around it (note: a few companies have).

> Is it compatible with C/C++ libraries (I mean in practice, not that they should work)?

Rust has zero-cost FFI into C, but cannot call into C++ (without it doing an extern "c" of its own) due to lack of a stable ABI.

Its perfect for that use, but 1.0 is still months away. No one is using it yet...

There are two big production deployments of Rust, and a number of smaller ones. The two are OpenDNS and Skylight.io.

That said, yes, doing so before 1.0 takes a special kind of organization.