Indeed, which is precisely why IMO if the ending is so integral to the whole trilogy Nolan isn't going to give it away in the title again. The formula was made clear as day at the end of the last two films, the ending corresponding to the titles with Batman beginning his career (Batman Begins) and Batman taking the fall for Harvey's crimes and operating as (The Dark Knight). Nolan knew the minute he'd reveal the title of the third film, he'd be hinting at the ending... and fans with a keen eye would pick up on this, which is probably why TDKR has come across so odd with some fans, it's meaning seems... far too obvious.
At first glance from The Dark Knight Rises what I got was that it meant the ending would be Batman being redeemed in the eyes of the public, and finally ascending as it were into the Batman from the comics. It's perfect for the character, but it's also kind of iffy because it contradicts themes Nolan keeps reiterating such as it being the conclusion to a story, instead of blowing up the balloon. This is why I'm of the belief that the title was purposely selected to trick the audience, to make them not expect something like a 'death' or 'retirement' when they go to actually see it in theaters.
That may seem far fetched, but think about that quote from Nolan's film "The Prestige".
The first part is called "The Pledge". The magician shows you something ordinary: a deck of cards, a bird or a man. He shows you this object. Perhaps he asks you to inspect it to see if it is indeed real, unaltered, normal. But of course... it probably isn't.
I think there's a symbolic meaning behind The Dark Knight Rises, but it's been put together in a way that seems sort of mundane and studio-ish so that you don't really look for it and just take the title at face value. And of course, taking the title at face value, would definitely rule out death or retirement, so I agree with that. I just don't think it's that simple. I don't think Nolan would want to give it away that easily, he'd want us to think that death or retirement aren't possible conclusions if they were part of the secret ending.