Here is the tweet:
"Marvel films is considering filming Captain America in the UK, WTF!"
Well, we already know some filming will take place on a stage in Raleigh Manhattan Beach Studios. I'm sure its just one of the many locations where the film will occur, considering the president of Marvel, Kevin Fiege, stated that "The First Avenger: Captain America will be one of the most International films, Marvel Studios has done".
This also sheds some light on the fact that we'll be seeing James Montgomery Falsworth a.k.a Union Jack, in the film. I would love to see Wentworth Miller tackle the role.