Cautiously optimistic!
Squad stuff: If Pogba does indeed leave we really only have Fred as a starter and a useful backup in McTominay, then Rashford as a starting LW and James should be the backup winger on both sides, so we need 3-4 starting midfielders and this would appear to be the first of them.
Rashford-(Martial)------RW (Greenwood, James)
-------------CM------Fernandes------------- (McTominay)
-------------------Fred------------------------------- (DM)
LB-----Maguire-Lindelof----WanBissaka (Williams, Shaw, Dalot)
-----------------De Gea----------------------------- (Romero)
a squad is basically 18-20 players up to it, we're obviously still 4-5 short but this is one down.
The player himself:
My guess is he'll be a bit of a Match of the day/highlights player in general but particularly at first, like people use to say about Gamst Pedersen or a player like Eriksen when he's not at top, top form. His shooting and crossing appear to be that good, and he's the right age and experience that he's probably in his peak. Not sure how he'll hold up athletically in the Prem. Might be another player whose strengths don't necessarily suit Martial in that he can cross and play balls in behind more than link up with dribbling and speed through the midfield.
He's definitely better than Lingard and Pereira so obviously an upgrade and if Pogba does leave it will take 2 players to replace his creativity and this could be one.
Tactically, we could also play 2 up front easier now if we want with say James and Bruno as wider mids who can be trusted to track back a bit and 2 of Rashford/Martial/Greenwood up top.