As far as i remember that comment was made concerning 1.0 players and the fact that when upgrading to the 2.0 client that it would be provided free of charge instead of having to purchase the game a second time, Any expansions following that however are likely going to require players to purchase them.
In addition considering the WoD expansion for WoW is priced at $49.99 U.S. for the standard edition or $69.99 U.S. for the digital deluxe edition, i wouldn't be surprised if SE followed a similar model.
