Collider's Frosty was taking to Twitter to see if anyone has questions for the Russo Brothers, and LatinoReview's El Mayimbe coyly took him up on that. Adding what very well could be his own scoop, that Black Panther is rumored for an appearance in Captain America 3. I truly hope this one turns out to be right on-the-money.
.@colliderfrosty Yes, please ask Russo bros if it is true THE BLACK PANTHER will be making an appearance in CAP 3? :)
— Umberto Gonzalez (@elmayimbe) August 27, 2014
There have been rumblings for years that T'Challa would have a cameo, before his own feature film. However, all we've had since those rumors have been easter eggs (Cap's shield/meta human map). It's said that Wakanda is actually going to mentioned and possibly even shown in Avengers: Age of Ultron, that also remains to be seen.
Kevin Feige has given an update recently during Comic-Con confirming Panther is back in active-development at the studio. We are expecting Black Panther to become one of the next new solo films announced by the studio. As the project was said to have competed against Guardians of The Galaxy for the August, 2014 release spot. There is even talk that Chadwick Boseman (Get On Up, 42, Gods of Egypt) is the top-pick for the role of T'Challa, another bit of information that originated from LR.
UPDATE: Co-director Anthony Russo was asked by Movies.com, what new characters would be included in the third film? His answer is obscure but promising since fans would "freakout" with this addition. The only character I could think off making fans freakout, would be Black Panther. Rogers and T'Challa have crossed paths on more than a few occasions, with Cap's modern-day globetrotting he'd have to at one point bump into Wakanda. Of course a new threat of HYDRA would also put the population of Wakanda at risk as well.
"I can't divulge who is going to be in the film, but I think the fans are going to freak out when they hear about it."
Speaking of Collider, Jeremy Renner mentioned Captain America 3 "rumblings" to the site. That's if he can find the time to shoot it, since he has Mission: Impossible 5 and Bourne 5 on-deck. We already mentioned what this could mean for Barton and the MCU, bulking-up his presence in the universe could lead to him getting his own superhero team to lead (Avengers West Coast).