rumors has been cycling around that Irrational has been working on Xcom since they annouced they were hiring for a favorite pc series. That was right after Take Two bought Irrational and the rights for Xcom from Atari

http://assignments.uspto.gov/assignments/q?db=tm&qt=sno&reel=&frame=&sno=74679753&rno=&asnr=&asnri=&asne=&asnei=&asns=&apct=&apcti=&rgst=&rgsti=