I'm piggy backing off another sites forum but arb claims if they get 500 messages from wk2 owners, they will start making parts for it. As many vehicles as jeep has sold, this shouldn't be hard!
Contact ARB | ARB 4x4 Accessories
On another note, after harassing bushwacker I've gotten this response:
Thank you for your interest in Bushwacker. We are currently working on designing flares for the WK2 Grand Cherokee's. I do not have a release date at this time, you can keep an eye on our website or Facebook page for updates. Thanks again for your inquiry.
I'm sure shooting them some messages wouldn't hurt either .