The Jack Kirby Settlement Rumour
The truth of the matter is as follows. The actual terms of the settlement are subject to a confidentiality agreement, and if anyone connected to the settlement breaches that agreement then the deal can be declared null and void, thus putting the Kirby Estate at risk. The same agreement applies in the recent settlement with Gary Friedrich Ghist Rider case. Some people know the true terms of the settlement but they won't be telling anyone connected to any rumour reporting web-site. Thus amounts being bandied around are just a guess. Here's how the rumours start. I can say that I heard from someone that Marvel gave the Kirby Estate one billion dollars and complete control over all of Jacks co-creations, but that doesn't make it fact. I can say that part of the agreement is that the family will get all the profits from the next Avengers movie - doesn't make it truth.
As for the 'credit in the movies' claims, well, if you've been paying attention to the credit scrolls in the various Marvel blockbusters than you'd know that Jack Kirby has had a credit in those movies for a while now. His name is there. However nobody connected to comic books gets their names above the title in a major studio blockbuster (and I'm not talking about low budget indie films). Thus you won't see "Jack Kirby's Fantastic Four" at the cinema anytime soon. Kirby's settlement was more than likely on a par with the Stan Lee settlement a while back, and I highly doubt that Kirby would have gotten any less of a monetary amount than was given to Lee.
The fact is that the only people who know the TRUE terms of the settlement are the people directly involved - the lawyers and the beneficiaries - and they're not going to be telling anyone what it is in any great hurry. But, by all means, keep reporting how someone 'connected to the family' are leaking the details. Name names. It'll only put the whole deal at risk.