He is training at Mike'sGym ( with Gokhan Saki and Badr Hari)
From what I heard, he is training hard as fuck now, he really is getting back in shape, getting his old kickboxing game back together.
If he doesn't keep his hands up he will get knocked out in training, against worlds best kickboxers, so expect him to give one hell of a fight in his next match, really looking forward to see him fight again.
Once every 2-3 day he started tweeting GOOOD MORNING etc, seems he is getting more positive less cocky, he didn't use to do those kinda nice things.
P.S. he is still a member of blackzillians, but he is fixing his game at Mike's Gym , so he is a member of both
here are some of his recent tweets :
Goooodmorning world

And again... It's all over for @ThisIsCLP Better luck next time bro Now pay up the €
Gooooodmorning! Rise & shine..
KO on the couch............... (somebody responded : What again!?!? DAMN IT MAN THATS TWICE THIS YEAR /// clearly indicating the bigfoot fight, overeem just said aahhahahaha)
Mooooorning!!
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I'm not an Overeem fan, but I used to cheer for him in K-1, I just really like that he is not cocky anymore