What is the status of debian/source/format 3.0 (git) GitSrc?

[Patrick Schleizer <patrick-mailinglists@whonix.org>]

Hello!

>From https://wiki.debian.org/GitSrc :

> The version documented here is included in dpkg 1.15.8.

> Q: How do I convert a debian source package to be built using the git format?
> 
> A: Although all that's needed for dpkg-buildpackage or debuild to build the new source format is to edit debian/source/format to contain "3.0 (git)", be aware that this format is not yet supported by the Debian upload queue, so only do this if you are experimenting with the new format.

So it is available in dpkg for quite some time now. Was has happened?
Has it been abandoned? Is it still being tested? Will it be fully
supported at some point in future?

Cheers,
Patrick