Swordsmen WS4. HA, Sh, HW (AS 4 also) but hit better.
Hal +1 Str 4+AS good for fighting higher T units while still attacking at initiative.
If Halberdiers came with FPA, noone would ever take Swordsmen - Because WS3 S4 is just so much better than WS4 S3. (also with FPA they get a 4+ save vs shooting, the Swordsmen don't.)
Also, people would probably not use Greatswords either, because S4 I3 is probably better than S5 I1 most of the time and the halberdiers would probably be cheap enough for people not to care about the fact that Greatswords are Stubborn. Especially if Greatswords keep beeing a special-choice. This is all hypothetical ofcourse since we have no way of knowing what a Halberdier with FPA would cost/modell.
That said, if Greatswords got say 2 attacks they might be a viable option.
(However I serously doubt that Halberdiers will ever get FPA in the first place. It's not that fluffy either.)
I doubt GW will change the basic stat line of the human so additional initiative is prob not going to happen
The basic human is indeed I3 - however state troops are trained humans and can get I4, evidently - just look at our current Swordsmen; they are I4.
It would only be fighty Statetroops (Sword/Halberds/Spearmen/Greatswords) that would be I4 though, Archers, Handgunners, Crossbows, Free Company and Flagellants should stay I3.