I had the same question.
I see that fixpack 7 is out but pre-reqs fixpack 3, but I'm not sure if I have fixpack 3?
db2level gives
DB21085I Instance "DB2" uses DB2 code release "SQL07020" with level identifier "03010105" and informational tokens "DB2 v7.1.0.40", "n010415" and "WR21254".
db2licm -l gives
Version Information = "7.2"
Mark.