Well, according to NHK's website, the animation studio has indeed been changed to Studio Deen. But, as ramlaen has said, the director, series composition, music composer, producer and production supervisors remain the same. Imho, these are the people who had made Log Horizon S1 so memorable and it's a relief that they're still here to make good anime.
Hopefully the switch to Studio Deen would improve on S1's greatest failing, which is the rather lackluster animation and art direction. I'm surprised that Satelight won't be taking up the challenge this time, but I guess it's probably busy with Madan no O on its plate
