How to check the status of this rfc,implement%20traits%20for%20all%20arrays.

I want to exercise by making linear algebra and numerical methods library.
Unfortunately in rust there is not way to write something like :

let a : Matrix<3,4>::new();

am I right ?, I made search in internet and found this rfc but i can't find what is the status of it

Aside from directly asking the people involved, the best way is to read the updates on the tracking issue linked from the RFC page. In this case, the min_const_generics feature (a subset of that RFC) is likely to be stabilized in Rust 1.50.