There are news about it on gimpusers.com. Thanks to Torbjorn, who posted in the forum about this.
Some highlights:
Years over years GIMPusers waited for this feature – now a dream has finally become true: Layer Groups for GIMP will be available in GIMP 2.8! more…
There is an interesting message of Martin Nordholts, one of the core developers of GIMP, in the official mailing list about GIMP 2.8 being shipped in a single window mode. more…
And finally a writeup of all the goodies we will get (perhaps for Christmas
):
Most probably, GIMP 2.8 will yet be released 2009, so it has been time to have a look at the current developer version. There are many cool new features, but the most important thing for us are the layer groups. more…
