If it weren't for that pesky Neil guy, Andy Diggle becoming the new Thunderbolts writer would be the coolest news of the Comic Con for me, personally, as Ellis' Thunderbolts was a really great book, so I was fearing the worst with his departure, and Andy Diggle is one of the few writers out there that is not much of a step down from Warren Ellis (whose Thunderbolts run was great).
At the same time, I remember a few years ago, when the signs all seemed to be pointing to Diggle being the next DC writer to make the move to Marvel, but then he stayed at DC, instead - and promptly did basically nothing of note (I mean, don't get me wrong, I have really enjoyed his Hellblazer work and I absolutely adored his Green Arrow: Year One mini-series, but he did not exactly have a ton of major projects that would make you say, "Ah, so THAT'S why he stayed!")!!
So while it's a few years later then one would think, he's at Marvel now, and I can't wait to see what he has up his sleeves for the Thunderbolts. I just hope Songbird isn't screwed!!