Thanks to Aostasera.it (via CBM), we have a live action, sneak peek of Elizabeth Olsen in Scarlet Witch costume. Here is a video of her and Hawkeye (Jeremy Renner) surrounded by panicking extras and scarlet smoke.
Wanda Maximoff dons a a short skirt, high boots and red leather jacket. Standing by her is Hawkeye who seems to be surveying the situation in total chaos, which looks like the work of Ultron.
Here are more pictures from the set.