You've got Red Hulk's story right. It seems like a pretty similar story is used in this show. Apparently, Ross thinks the Avengers need "a soldier, not a monster" on their team. Not sure about the details, though. Somehow I didn't catch wind of storyboards for the second season that were released online at the beginning of the month. I didn't hear about them until they were already removed, but toonzone forum posts have revealed a lot of the info that the storyboards provided. I forgot to post this in my last post, but it looks like the Scott Lang story is about Crossfire kidnapping Cassie (Lang's daughter), so he steals Ant-Man's costume - which is probably to use when he delivers ransom money to Crossfire. This is pretty similar to his story in the comics, which involves him using Ant-Man's armor to help an ill Cassie. There's also a scene where all the Avengers battle their Skrull counterparts at some point in the season.
Unfortunately, it looks like Ultimate Spider-Man is delayed until 2012. On the bright side, at least we'll be getting a 26 episode first season. That's a first for a cartoon about the web-slinger. It seems like that's the trend with cartoons nowadays, which I'm certainly in favor of. Perhaps this show will be intended to promote the upcoming film, although I doubt they'll have any continuity. The cartoon will probably be the same quality as this series, not quite as awesome as some of the DCAU cartoons, but still great. It'll be nice to see a twist to the classic Spider-Man and a series featuring many team-ups. I'd prefer to see this in a Spider-Man series than Avengers, as we've already had many Spider-Man cartoons, and this is our first faithful Avengers adaptation.
The film seems to be making the foolish mistake of retelling Spidey's origin. You just don't do an origin on the silver screen twice. It gets old. Personally, I'm a big fan of all three of the old Spidey films, but I'm glad they cancelled the fourth one. I didn't know Black Cat was planned to be in it. Putting two heroes in a live action film is another big mistake. It just seems...wrong. When you spend thousands of dollars on a 2 hour live action threatrical release and you only get one film every 2-4 years, you shouldn't be taking the spotlight off of the main heroes. That was a mistake Fantastic Four: Rise of the Silver Surfermade. Nonetheless, I don't expect to be disappointed with the film.