Well, I've scribbled on and on around other threads about what MY ULTIMATE IDEA FOR BATMAN 3 is, so I'm gonna go the humble way and just talk about themes here.
If we follow the story from BB and TDK, and focus on well, Bruce, we see a few logical steps out there -
Movie 1 = Bruce constructing the 'Symbol' or 'Idea' of the Batman.
Movie 2 = Bruce dealing with being the 'Symbol' and what it means to maintain it, most notably a) the death of his loved one or "reprisals" from the enemy b) losing allies and all sense of normalcy c) facing the ultimate anti-thesis, or counter-Symbol to his own (I dont have to explain that do I?)
Movie 3 will therefore be about what happens when Symbols or Ideas are corrupted. From an ideological standpoint, this isn't new - every good idea ever envisioned has been corrupted down the line. That was the whole of the sermon: "You either die a hero, or live long enough to see yourself become the villain." With the Batman persona now attracting more 'Freaks' than repelling them; the symbol of 'hope' deconstructed into an element of 'fear' even for those who were "fearful" or had to be saved. While Gotham is preserved knowing that the Batman is a dark entity guarding the nights, the message of hope is lost. The symbol is corrupted. And perhaps with the next antagonist this will be more so. Which leads me to what the next 'antagonist' will be:
Again, looking back at the 'trilogy' here's what I figure:
Batman Begins = Batman fighting Criminality (that's why there were multiple 'villains' throughout the acts, as opposed to one force of evil that's in the second film).
The Dark Knight = Batman fighting the ultimate Criminal (whether it's the Joker or Harvey Two-Face, a man on a moral and psychological, even tragic, lapse, is up to interpretation). And finally,
The Dark Knight Rises = Batman fighting Criminal-ism (he combats the notion of having becoming the thing he fought the most). If that isn't a true trilogy exploring themes of heroism, I don't know what is.
Of course, reading this you can probably say that these themes can be subtle and can be found in any given PLOT. That, I'm afraid, is another subject entirely. But I'm almost certain of two things: that the core of the plot will be inspired from Dark Knight Returns' last chapter (when Batman has become a "political liability"), with possible allusions to a new public 'savior' (it's hard to imagine what that would be since it's not Superman); and that it might end with Bruce Wayne's identity flushed out in public, his death announced, and Alfred blowing up the new Manor, all taken from the graphic novel. There are some additional issues that will need addressing - namely that both Mr. Reese and Det. Ramirez are aware of information that they shouldn't know.
Nolan might surprise me, but this sounds a lot like what we may be looking at right now. There won't be a "clean slate" like we're made to believe. Bruce never fought for the public's appreciation, the dark knight and all the guilt surrounding this 'fall' came from the deaths that he inadvertently caused through his life. It's redeeming himself from THAT GUILT, perhaps once again burying it in anger (or realizing it wouldn't be enough anymore), that becomes the center-piece of the story (or trilogy) and eventually gives us a definitive conclusion... one that doesn't equal an 'end'. Hence, The Dark Knight Rises from the pits of the Bat-cave, straight from Frank Miller's book.
Here's another worthy note about the Bat-cave that occurred to me: In TDK the 'bunker' cave in the city was demolished right? Alfred burned out all the evidence prior to the Joker's initial arrest, when Bruce was thinking about outing his identity. That one's out. The original Bat-cave remains undisturbed from BB for all we know, that's where we'll see most of this movie. That leaves the only other (known) base to be under Wayne Tech - the one controlled by Fox. Maybe the govt. will get rid of that instead of the actual cave? Who knows. Oh and, maybe this won't ever happen, but Harvey's coin, the Joker's card, the Scarecrow's mask, Ra's' gauntlets, Rachel's "gift" (finders keepers?) from the first film, Thomas Wayne's stethoscope, the original and secondary bat-suits, remnants of the tumbler, and the new and improved Bat Computer should be displayed in the batcave, perhaps as easters, but there for a reason nevertheless. AANNND, get Sarah Essen.
There, that pretty much says what I want from the new movie. What do you guys think? I really want to know your feedback on this. Thanks for reading.