Nope, he isn't. I've read interviews with Abbath about Immortal's split, and in at least one he declared that the important thing for him now is to focus on sports and being physically fit, or some such. This is probably so that, in a few years, he can reform Immortal and reshoot the video for Call of the Wintermoon, with his new ripped body, and do crazy shit like fly around like a bat, at night this time, and be altogether grimmer than ever. \m/
Edit: I just thought of it: GRIMnastics!!! Ha! Ha! \m/ (~_~) \m/