They say part way down the page "We will provide an interface that will allow you to submit your solution for grading closer to the due date. Instructions will be made available on the main course site.". Although that's the only reference to a due date that I can find.

There is zero chance anyone will actually complete this in a reasonable time-frame (except for those small number of people who have already done it, and I suspect even they would fail to accomplish it).

No compiler vendor (gcc, clang, msvc, intelcc) has produced a bug-free implementation of C++11 so I would contend that no one has already done it.