I get the sense, from some of the developer posts, that Bioware are going to constantly update the endgame as the months go on.
Adding a new boss to an operation, doing different things with space combat and adding PvP maps etc...
Only time will tell.
I'm at the endgame and I have more than enough to do to equip my char. That doesn't mean other players that got to 50 quicker than me don't have things to do, but you've got to remember the game needs time to balance and stabalise i.e. more lvl 50's, a better economy etc...