Here are some comments made in the SJG GURPS forums, on updates required to bring the GLAIVE weapon creation system up to 4e speed:
http://www.gamesdiner.com/gurps/glaive.htm#Top
* Treat any reference to "Load ST" as "BL/2".
* The "unbalance modifier" should probably be changed, in light of the way 4e unbalanced weapons have become faster. Change from x1/x2/x3, to x1/x1.5/x2.
* Some missile weapons rules may need tweaking, if 4e weapon stats vary much from 3e.
* The bow rules state that they'd work better under "quad ST" -- which 4e now provides.
No, no plans yet to actually rewrite GLAIVE.