RE: The Captain Britain and Black Knight rumour.
I. Am. Here. For. It.
As someone who lives in London, it'd be amazing to see some hero action there. It could allow them to expand the universe even more. Using Edinburgh in Avengers 3 could easily be the origin point for the United Kingdom getting involved. Braddock Manor is located in Essex so it's literally right beside the nation's capital. As we all do, I have some fan casts that would be amazing to see on screen.
Namely:
Oliver Jackson-Cohen as Brian Braddock (Captain Britain) and
Lily Collins as Betsy Braddock. They're only a few years apart in actual age and could easily play twins. He's very "English Gentleman" and what you would expect from Captain Britain. Lily has proven to play fun and serious characters, and it helps that she could easily be a supermodel if it's pre-Psylocke. I know the Eurasian Betsy is more known but if they're rebooting the character, I say just stick with her original appearance.
Jamie Bell as Dane Whitman (Black Knight). I know he's traditionally American with English ancestry. Just make him English.
Teresa Palmer as Meggan. Yes, she's Australian, but Meggan is a faerie from the Otherworld. Her accent has room for interpretation if it isn't perfect. She just looks ethereal.
Max Irons or
Jeremy Irvine as Joseph Falsworth (Union Jack). Just mix Joseph Chapman and Brian Falsworth, keep the LGBT aspect and have him rebelling against his aristocratic background. Or, make him a rough-and-ready boy from the streets with lofty aspirations. Max would work better for the former, and Jeremy for the latter. It's be a nice what to finally have a LGBT hero, which isn't an agenda. It's just simple probability, there should have been someone by now.
Each of these characters could easily be drawn together as Excalibur.