I don't think he will be complacent, Hatton will snap him out of any complacency by round 2 if he is.
Floyd will take Hatton very seriously and so he should, the Fatboy will prove to be a handful.
I actually believe Tszyu took Hatton a little lightly before their fight and thought he would walk right through Hatton, he got a huge shock as we know.
I think Floyd will be well prepared for an opponent who will attack him on all fronts.