QB - IMHO it will be a upgrade. Offense can't be successful with a QB with Happy feet.
RB - will be much better.
TE - will be better
WR - don't think it will be worse but has a chance to be a major upgrade.
OL has 3 solid starters and we shall see on the development of the others.
Offense will have more explosive players on the field so it could balance the shortcomings at the OL (if they really are shortcomings).