I read about that bosman thing somewhere, I think you could be right ajc. Guessing that the UK would alter their law to allow for something like that now - but who knows? The old people voted this in, maybe things will be done old ways.
I also thought the same as you about residency, but I did read a list somewhere on twitter of players who apparently wouldn't have qualified for work permits last season under non-EU law, and Sagna and Clichy were both on it, which made me double take. No idea how reputable the author was though.
Edit: Did just see this quote from FA Chairman Greg Dyke; “Should the UK remain a part of the EEA, like Norway, then it will have to continue to accept the freedom of movement principle and little will change for English football.”
Also found a link with some decent info about possible impacts on EPL, put it over in the arsenal thread ajc