Back on topic (Directors)....
I know Iron Man 3 didn't go down particularly well with the comic/Marvel fanboys, but watching it on tv right now, his direction is better than solid, he gets great performances - Downey riffs off him superbly and Kingsley gives his best since Sexy Beast (before, but especially after Iron Man 3's big reveal). He directs a satisfying action packed finale (the best of the Iron Man movies, i think).
It's not all about things blowing up (of which there's plenty), but what makes his finale way better is that the script has set up plenty of stuff, secrets and tensions that he can pay-off amid the mayhem; there's dramatic progression there, rather than just pyrotechnics and CGI. That's perfect for a great Bond movie many of which succeed or fail by the quality of the final villain v. Bond confrontation (the good ones have high stakes and character driven action, with plenty of wit (that's wit, not comedy). The poor ones involve lots of henchmen, shooting and explosions, but very little character driven resolutions.
To be fair to Bond, they invented this balancing act between action and dialogue (well, actually i think Hitchcock did with North By Northwest and Bond made it his own). But i think Black proves adept at this balancing act (he already had with his Lethal Weapon and Last Boy Scout scripts, but for me he's now proven he can shoot his fantastic scripts as well as anyone, if not better (naturally, i think it'd be crazy to snag one of the best action writers of all time and not have him write B25, as well as shoot it)
And of course his sharp, witty and very clever non-expositional dialogue is second to none (including Tarantino, but with the exception of Woody Allen in the 80s)
With Nolan busy Dunkirk and Eon Refn unlikely to risk it with Refn (not that he's ever really been mentioned anywhere apart from my posts here), Shane Black is fast becoming my favourite for B25. But his availability with Predator would be the potential issue.
This.
Also, composer Brian Tyler could make a pretty killer Bond score.