I'd rather Clark be suspicious from the start, and maybe tell someone he trusts (who LATER betrays him accidentally)
I think it would be deep if Bruce let his guard down because of his paranoia against Supes, while Clark built up some walls of suspicion because of his fear of being manipulated. I think even "normal" people can get out of character in extreme circumstances, and what can be more extreme than a vigilante and supervillain on the loose (and possibly one from Batman's rogues gallery)?
I like this, but I don't really have any ideas to add to it. I would really like to see Jor-El's "They will stumble, they will fall, but in time they will join you in the Sun" line to come back. In Man of Steel we just kind of see all of these humans join with Kal too easily, and some of those guys, like Dr. Hamilton and Colonel Hardy, and I'd say about 10 other soldiers that were on the C-17, are now basically sitting in the Phantom Zone. So, that could help facilitate some apprehension towards Superman (maybe even not that pronounced, as you said, someone accidentally betrays him) so he has to sort of relearn that lesson. Not that he's dumb and can't get it right the first time, but maybe he was just more concerned with doing the right thing than doing the thing right as far as 'coming out' in the first film that the lesson takes on multiple meanings. So in essence, we would maybe see Jor-El is a LOT wiser than he appears to be (which is still pretty wise, considering, it just adds a little more character to Jor-El, which could be useful in the sequels).
Maybe not in this film, but possible future solo films should touch on the Codex in some way. It still nags me that the start of the film was Kal-El's actual birth. Thematically for a film series it kind of means we will see his death at some point.
I agree with this. Not sure if I would want it to be Bizarro, or Doomsday, honestly. I don't see HOW it could create Doomsday--I'm just not that familiar with that character--as opposed to Bizarro. But if you can put Doomsday / The Death of Superman / Superman Lives into this universe, a few movies down the line, it would be absolutely epic in terms of escalation of character, motive, emotion (after knowing all of these characters better), while also upping the ante for the directing and special effects after the Zod fight...
That's really the only thing that I'm worried about with the sequels. After the Zod fight and the
$2 Trillion worth of damage in Man of Steel... how do you raise the stakes?
Quite simply, it doesn't need to be done... yet. The world needs to reel from that for a while, and that leaves us in a great place for the genius character study that Batman Vs. Superman has the potential to be. It doesn't have to be big budget popcorn destruction stuff. The next film can afford to be a bit more laid back action wise and a bit more cerebral... and I think the DCCU could benefit from that a bit.
Just my two pennies worth on that... just an opinion. No big.
EDIT
They should definately retcon MOS so that he's looking around for survivors after the Zod attacks. A flashback would be appropriate, or Superman could have nightmares about the people he couldn't save.
Oh, snap. They could totally do that, and it would be simple. It could be a flashback that ties into the main narrative the same way the flashbacks in MoS tied into that main narrative. You know, see a school bus, remember a school bus. It has lots of possible contextual applications for something that simple to be added in. Government Inquiry, Batman Interrogation, Nightmares, Perry White wants to put a spin on the story about the Aliens, etc.