When asked on twitter if UT was coming back, vice president of EPIC games Mark Rein had this to say:
"<-Yes UT coming back!"
Link here. Lets hope they learned from their mistakes with UT3.
Also the original creator of the UT2k4 death match map "Runoff" has remade the map in UE4 and posted a Video on Youtube, it could be related tot he tweet.