Marvel Studios President and producer Kevin Feige held a Q&A session after a Guardians of the Galaxy sneak preview in London, where he surprised fans with a two-minute sizzle reel from Avengers: Age of Ultron. Radio Times was on hand for the event, and described some of the epic fight scenes that were shown, including a showdown between two Avengers.

Back in March, Marvel Studios revealed a few pieces of Avengers: Age of Ultron concept art, which included the new Hulkbuster suit worn by Tony Stark (Robert Downey Jr.). Part of the footage shown includes a fight between Tony in his Hulkbuster armor and the Hulk (Mark Ruffalo) himself. Although it isn't quite clear why they are fighting, the site described the armor as follows.

"Known as the 'Hulkbuster' in the comics, it looks like Stark's normal red and gold armour after hitting the gym, and is almost the size of the Hulk himself. Where his normal suit is sleek as a missile, this is bruising like a tank."

New additions Elizabeth Olsen and Aaron Taylor-Johnson were also shown as Scarlet Witch and Quicksilver, with Scarlet Witch fighting alongside Hawkeye (Jeremy Renner) on a demolished Italian street. She was also shown displaying her "warping powers" by making bricks float in the air, along with her speedy brother Quicksilver in a Perspex prison cell. This scene likely follows the end credits stinger from Captain America: The Winter Soldier, where they were seen being held captive by Avengers: Age of Ultron villain Baron Von Strucker (Thomas Kretschmann).

The redesigned Avengers Tower was also shown in the new footage, which was described as follows.

"Designed by Tony Stark out of the ruins of his New York penthouse, this has all mod cons: floor to ceiling windows, twin laboratories for Stark and Bruce Banner, and parking for supersonic jets. It's reminiscent of the SHIELD helicarrier in terms of construction, with lots of shiny metal pillars."

As previously reported, this sequel will be an international affair, with the Avengers squaring off against Ultron (James Spader) and his army in Italy, South Korea and South Africa.

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Kevin Feige did say at the presentation that this footage may never be shown again, but it's possible that these scenes may be a part of Marvel's Comic-Con 2014 panel in Hall H, so stay tuned for more updates. Are you excited about seeing this footage for yourself? Chime in with your thoughts below.