As a few have previously stated - I definitely think the squad has been improved but other than Okore and Luna (when/if he signs) I can't see any of the others improving our starting 11. A bit of creative guile in the midfield is vital in my opinion, someone like a Belhanda or Praet (I appreciate both may be a tad unrealistic).
It's not even July yet though, so I'd expect to see plenty of outgoings with perhaps 1 or 2 new faces which will hopefully improve the starting line up rather than just the squad.