I'm probably being extremely naive here, but i'd imagine it was somewhere between £800k-£500k p/a, as a guesstimation. Method to the madness....
If the average wage for the squad was around £500p/w ---> £2000p/m ----> £24,000p/a. Around 20 contracted players, so 20 x 24,000 = £480,000p/a on wages.
If it was more like £800p/w ---> £3,200p/m ----> £38,400p/a. 20 x 38,400 = £768,000p/a on wages.
Obviously, there will be a few players earning double the average, but that'll be offset by the loanees/youth teamers in the squad. Can't see it being much more than that anyway.
But, of course, this is all complete guesswork, and has been posted as a timewaster while i'm meant to be working, so is probably best ignored
EDIT: Of course, i'm talking pre-Wise/Poyet/anybody else that has/is joining over the Summer