Just leaving this here (taken in Atlanta): https://www.instagram.com/p/BWyZXbtBko5/

I am guessing that this means no appearance at SDCC this weekend.

Marvel has also got a large stand at SDCC with many costumes including Loki. That suggests to me for some reason that the owners of the costumes are less likely to show - I feel like Marvel wouldn't be showing off the costumes so early in the con if it had something better.