According to The Daily Mail, Earth’s Mightiest Heroes are set to reassemble at Pinewood Studios in January for two weeks of reshoots on the upcoming sequel Avengers: Age of Ultron, designed to make the film “a bit more kick-ass on an extravagant scale.”
The report states that not all actors will be required, although Chris Hemsworth (Thor), Robert Downey Jr (Iron Man), Mark Ruffalo (The Hulk), Jeremy Renner (Hawkeye), Paul Bettany (The Vision), Scarlett Johansson (Black Widow) and Tom Hiddleston (Loki) are said to have been contacted regarding the filming of additional scenes.
Meanwhile, the article also suggests that the UK will play host to production on Avengers: Infinity War, with Part 1 and Part 2 shooting back-to-back, most likely at Pinewood.
Avengers: Age of Ultron is set for release in the UK on April 24th 2015 and North America on May 1st 2015, with Joss Whedon directing a cast that includes Robert Downey Jr. (Iron Man), Chris Evans (Captain America), Chris Hemsworth (Thor), Mark Ruffalo (The Incredible Hulk), Jeremy Renner (Hawkeye), Scarlett Johansson (Black Widow), Don Cheadle (War Machine), Cobie Smulders (Maria Hill), Samuel L. Jackson (Nick Fury), Paul Bettany (JARVIS / The Vision), Aaron Taylor-Johnson (Quicksilver), Elizabeth Olsen (Scarlet Witch), Hayley Atwell (Peggy Carter), Idris Elba (Heimdall), Tom Hiddleston (Loki), James Spader (Ultron), Thomas Kretschmann (Baron Strucker), Josh Brolin (Thanos) and Andy Serkis in an as-yet-unrevealed role.
https://www.youtube.com/watch?list=PL18yMRIfoszH_jfuJoo8HCG1-lGjvfH2F&v=-j45pMw-oDk&feature=player_embedded