The Summer Transfer Window IS Open
There seems to be some debate as to when the transfer window opens.
This is the definitive: www.premierleague.com/staticFiles
The rules read:
Prem league rules, page 150 on transfers: 2. The first Transfer Window in any year shall commence at midnight on the last day of the Season and shall end on 31st August next if aWorking Day or, if not, on the firstWorking Day thereafter, at a time to be determined by the Board.
I have also, just to be doubly sure that no rule changes have come into place, double checked with the Club and been told the rules are correct and the transfer window is alive and kicking.