It makes sense from a story standpoint, and indeed games should have the same rights as movies, comics and books to let loose with the language however the author sees fit, but it's just unfortunate they went this route, in a sense, when the game could've helped to push the medium forward from a social acceptance standpoint but instead will now turn off many people (family members, ect) at the first excessive swear, when otherwise they might've stuck around long enough to see the game balances all that with plenty of humanizing moments and creative takes on the "future." But really, it all boils down to context, so we'll see how they handle it. No judging until the final product... I trust they're not throwing in swears to attract the CoD/Battlefield "kill kill kill" crowd.
(As an aside, I have no problem with swearing in itself, Bulletstorm being my GOTY last year, but it has to fit the game. We'll see.)