They announced a few months ago on their Facebook page that they got it, and then promised an update...but an update never came. They later clarified that they were trying to get the rights to the extended cut, and that they had hit a bit of a delay because the negotiations were not being resolved as quickly as they had hoped (and this, by the way, is why other anime companies take so long to announce their acquisitions: they don't want to announce anything until they've got all those details settled...can you imagine how awkward it would have been if Universum said they were trying to get the extended cut, only to later say, "Well, turns out we didn't get it...sorry"?).
However, they announced on April 1st (which they then had to clarify in the comments section was not an April Fool's Day joke after someone asked) on their Facebook page that they did, indeed, manage to get a hold of the extended cut! No announcements yet regarding casting, although they indicated months ago that they would try to get as much of the original German DBZ dub cast back as they could. They'll be premiering the dub at a German anime con, AnimagiC 2015, and a few months later, a DVD and Blu-ray release will follow, with a limited edition included. No word yet on whether or not that will include the original Japanese audio track with German subtitles...you'd think that would be a given, but they deemed the original Japanese audio track for DBZ to be too expensive, and so the German DVD release of the show doesn't have it.
Their announcement is copied below, with a Bing translation of their announcement into English right below (baring in mind that "synchronization" is their term for dubbing, and "spokesman" or "synchronize-speakers" are their terms for dubbing actors):
":: DRAGONBALL Z: KAMPF DER GÖTTER ::
Hallo zusammen,
wir wissen, dass wir lange Zeit nichts von uns hören haben lassen in Sachen Dragonball Z. Aber wir freuen uns Euch mitzuteilen, dass wir den Extended Cut nun für EUCH nachverhandelt haben.
- Sprecherauswahl: Wir können zum gegenwärtigen Zeitpunkt noch NICHTS sagen, da wir mit der konkreten Planung der Synchronisation erst in den nächsten Wochen starten werden.
- Veröffentlichungsplanung: Nach derzeitigem Stand (wir betonen DERZEITIGER STAND!) planen wir die Deutschlandpremiere auf der AnimagiC 2015 inkl. Vorabverkauf der Limited Collector’s Edition (inkl. DVD & Blu-ray + Booklet + Postkartenset). Der reguläre Veröffentlichungstermin der Standard DVD, Standard Blu-ray und Limited Collector's Edition ist dann für ca. Mitte/Ende August geplant. Die unverbindlichen Preisempfehlungen werden wir zu gegebener Zeit nachreichen!
- Aufruf: Bitte postet in den Kommentaren, alle Eure Anmerkungen die Ihr habt (BITTE kurzhalten und KEINE Romane

Viele Grüße
Euer Team von Universum Anime"
BING TRANSLATION:
: DRAGON BALL Z: BATTLE OF GODS:
Hello together,
We know that none of us have heard long time let in terms of Dragon Ball Z. But we are pleased to inform you that we now have renegotiated the extended cut for you.
-Selection of spokesman for: we can say anything at the moment because we will first start with the planning of the synchronization in the next few weeks.
-Publication: current (we stress state of play!) we planning the Germany premiere at the AnimagiC 2015 including pre-sale of limited collector it Edition (incl. DVD & Blu-ray + booklet + post card set). The regular date of publication of the standard DVD, Blu-ray standard and limited collector then there is Edition for approx. Planned mid/late August. We will submit the non-binding price recommendations in due time!
-Call: Please post all your comments you have in the comments, (Please keep brief and no novels

Many greetings
Team universe anime