I was browsing some CA P-dealer web sites, and some dealers list 2005 997 C4S cars in their inventories. Is that for real? Has there been any official announcement?

Here is one example:
2005 C4S

Note they say "Drivetrain: AWD & PSM".

 

Oops. I guess P is still selling 996 C4S as a 2005 model.