from what i have seen from watching on TV over the last couple of years...
forde - genuine wide player (very right footed)
Taylor - attacking and plays from a wide position (both sides) but will look to get alongside a central striker when ever possible.
vaullks - box to box type player. very energetic and fit. All round midfielder.
Scott Allan - ball player. likes to get on the ball and control things. not that quick but very creative. IMO to get the best from him he needs to play in a free role behind the striker or in central midfield if playing 4-5-1 but he is not the quickest and certainly not defensive so needs a holding player alongside him.
Jake Forster Caskey - Attacking, creative, left footed. Again likes to get on the ball and make things happen.
the Allan and JFC signings certainly seem to suggest a different way of playing with looking to keep possession instead of going long early.