I just did a search online and this was the first link I found. An article saying a tweet came out today saying :
"I am pleased to announce that an updated beta version of the #Theme Builder with support to all 6.0 devices will launch by end of January."
Yay!!! This is great news...the only reason that I haven't bought the 9780 yet is because I didn't want the stock theme. Can't wait for this to be released so I can upgrade my phone!!