A nasty, enraged fight between Bond and Greene sounds very good indeed. I love down-and-dirty fights, and Craig seems to excel at them. Give us some good drama for the fight to arise out of, as seems to be the case, and we're all set.
The comments that QUANTUM OF SOLACE is "very dark" are also quite promising.
Talking of Bond being incapacitated, that would fit in with what I'd like to see for the conclusion of QUANTUM OF SOLACE. An injured Bond summons all his reserves of energy to eventually overcome Greene. He is left a wreck, and welcomes the back-up forces who come to retrieve him from the final showdown with Greene. Yet as they load him into transport to a hospital, Bond realises that these are not friendly figures at all and the organisation has captured him. Thus leading to a cliffhanger ending to BOND 23, and possible future use of the brainwash plot from 'The Man With the Golden Gun' novel.
Interesting, like the Bondian version of the finale of 24 season 5. But it's
far too early in Bond's career to make use of the very ridiculous "brainwashing" story. The idea of Bond returning to service after such an event is ludicrous, even after a great career, and it would feel positively ridiculous to have it happening within his first few years as a Double-O. Bond seems to be viewed as something of a liability by M already - no need to push that any further.
Now, as far as a cliffhanger is concerned, I'd be fine with QUANTUM OF SOLACE having a sort of cliffhanger, though I'd like it in more of a subdued, Fleming's YOU ONLY LIVE TWICE style. An ending where things are largely resolved, but there's some ambiguity towards the future.
That said, I doubt it will end in such a way. Forster seemed to stand very firmly on the independence of QUANTUM OF SOLACE in the press conference, and indicated he had no knowledge of the future plans for the franchise, and Craig says it carries Bond's character to a place of resolution.