From a few videos I’ve seen so far the Veteran Musketeer model no longer has tricorn hat but some sort of a feathered cavalier hat.
Swedish Caroleans have tricorns though.
It’s just a little odd to me how the musketeer portrait wears a tricorn, and the game promotion arts & videos heavy feature tricorns, but most European civs do not have a regular unit with them.
(Forget about minutemen though, but the arts & videos definitely feature musketeers with tricorns)
Edit: Tricorns were almost the most distinguishable feature of European military in 1700s, just like mitre caps for grenadiers or shakos for 19c infantry (guard/imperial musketeers). It’s a pity if we don’t have them and I can’t really see this change as necessary.
Honestly, if you take a closer look at it, the hat for original veteran musketeer does not look like a typical tricorn either (if you compare it to that of the militia)
It’s more like what you got if you unfold and extend the hat.
The new model does look a bit “tricorn-like” from the front just like the original. Maybe what is missing is the white brim.
(image from reddit https://www.reddit.com/r/aoe3/comments/jhslnb/veteran_musketeer_hat_change_and_the_removal_of/)