Yes it's true. Here are some screenshots of Grok and I playing in the new universe:
http://forum.valhallalegends.com/files/wow/alternateuniverse1.jpg
http://forum.valhallalegends.com/files/wow/alternateuniverse2.jpg
http://forum.valhallalegends.com/files/wow/borderwetlandsswampofsorrows.jpg
http://forum.valhallalegends.com/files/wow/grokwheretheskymeetstheearth.jpg
Here are some shots of Grok levitating and climbing impossible cliffs:
http://forum.valhallalegends.com/files/wow/grokclimbsmountain.jpg
http://forum.valhallalegends.com/files/wow/grokdancesondwarf.jpg
Grok > Dwarf.