D-Day for DMD is today!

[via Digitalmars-d-announce]

On Friday, 4 September 2015 at 12:38:41 UTC, Daniel Murphy wrote:
> It's not that phobos is bad, it's that we're following the same 
> development pattern we had with C++.  We're using a 
> conservative subset of D features and libraries, and slowly 
> expanding what's acceptable. For example, DMD now uses foreach 
> and delegates in a few places, and I expect we'll see a lot of 
> use of D strings in the near future.

Is there any place where this is documented? For instance, what D 
constructs are currently allowed, whether/which phobos imports 
have started to be accepted, and so on?