Update: Cast members seen so far: Steven Yeun, Lauren Cohan, Michael Cudlitz, Josh McDermitt, Sonequa Martin-Green & Alanna Masterson. Apparently some plastic (?) has gone up around the perimeter of filming I'm told so this distorts the views from the tiny area where onlookers are gathered. No idea if this is fencing/related to special effects or something altogether different.
Other cast members may be on site or filming later since the shoot continues until later this evening.