"Avengers: Age of Ultron" teaser won the internet last week and it spawned many theories and speculations. The Black Panther rumor is making more sense by the minute and certain scenes seem to confirm a previous rumor.
The movie rumor site Movie Pilot differs from the other scoop sites as they have space for theories and speculations (come to think of it, a lot of alleged scoops ARE speculations). Despite having seven months more before the movie, the end credits of Avengers: Age of Ultron is already in play.
The appearance of Andy Serkis and his resemblance to Ulysses Klaw is definitely an introduction to Black Panther, according to MP's claim:
"We know for a fact that part of Age of Ultron was filmed on location in Johannesburg and other locations in South Africa, prompting a lot of speculation that one of the locations of the sequel could very well be T'Challa/Black Panther's Wakanda. Now, while it's obviously a regular practice for filming locations to stand for other geographic places (Detroit as Gotham, anyone?), it doesn't really make sense that they'd film in South Africa for any other reason than to become the fictional nation of Wakanda."
It seems to easy that South Africa would be a location for Wakanda. There is also the Ulysses Klaw reference. Movie Pilot has Klaw being an Ultron ally:
"(Klaw) is obsessed with vibranium. In the comics, he steals it from a deposit in Wakanda to fuel some of his inventions (and runs into Black Panther in the process, becoming his sworn enemy for life). It's also worth noting that at one point in the comics, Klaw is kidnapped and imprisoned, but then later freed, by Ultron under an alias. We have already seen something of the Stockholm Syndrome relationship the Twins seem to share with Ultron in the trailer - perhaps Klaw might also be under a debt of gratitude to Ultron for 'freeing" him?'"
T'Challa could appear in the credits as the Avengers turn over Klaw- in a Thanos style cameo like the first movie. With regards to casting-Marvel might not have figured that out yet and Panther could be in costume. After all, Josh Brolin was cast as Thanos way after his appearance in the first Avengers.
May 1, 2015 could not be far enough!