Thomas R. Holtz, Jr. wrote:
An abelisaurid affinity has been proposed, as has a non-tyrannosaurid tyrannosauroid position. I would say that the latter is more likely, but given how scrappy the material is, there is not much confidence in that.
The DML archives contain some sobering words on _Labocania_...
http://www.cmnh.org/dinoarch/1999Mar/msg00629.html http://www.cmnh.org/dinoarch/1999Aug/msg00404.html