ZeniMax Suing John Carmack And Oculus Rift?

According to this Wall Street Journal article, John Carmack and Oculus Rift have been put on notice by ZeniMax's legal team. eek! Thanks to everyone that sent this one in.
In recent weeks, lawyers for ZeniMax have sent two letters each to Oculus and Facebook, saying former ZeniMax employee John Carmack, who joined Oculus last August, improperly took ZeniMax's intellectual property with him to Oculus, according to documents reviewed by The Wall Street Journal. That technology, the company claims, propelled Oculus from a shoestring startup to technology's big leagues in less than two years.