Is autodecoding being phased out?

[Dukc via Digitalmars-d-learn]

I (finally) managed to build the development build of dmd, with 
libraries. When testing if it compiles a Hello World program (it 
does, no problem) I got these messages:

C:\D\dmd2\windows\bin\..\..\src\phobos\std\stdio.d(2716,24): 
Deprecation: function std.utf.toUTF8 is deprecated - To be 
removed November 2017. Please use std.utf.encode instead.
C:\D\dmd2\windows\bin\..\..\src\phobos\std\stdio.d(2716,24): 
Deprecation: function std.utf.toUTF8 is deprecated - To be 
removed November 2017. Please use std.utf.encode instead.
C:\D\dmd2\windows\bin\..\..\src\phobos\std\stdio.d(2727,40): 
Deprecation: function std.utf.toUTF8 is deprecated - To be 
removed November 2017. Please use std.utf.encode instead.

If I output a dstring instead, those messages vanish. Does that 
mean we're getting rid of autodecoding?

If that's the case, have nothing against that. In fact it is nice 
to have that deprecation to catch bugs. I just thought, due to an 
earlier forum discussion, that it's not going to happen because 
it could break too much code. That's why I'm asking...