Avengers: Age of Ultron star Robert Downey Jr. took to his verified Twitter page this morning to tease that there will be a "big Avengers announcement" on tomorrow's episode of ABC's Good Morning America. The actor shared an image along with his tweet, which doesn't reveal much except part of his Iron Man armor, while the Good Morning America Twitter account revealed a different image that shows the quiver full of arrows used by Hawkeye (Jeremy Renner). The late night talk show Jimmy Kimmel Live! also got in on the fun by tweeting out another teaser image, which is all part of the puzzle. So, what could this announcement be?

It's possible that Good Morning America will unveil a new clip from Avengers: Age of Ultron, or Marvel could possibly confirm previous reports from last month that directors Anthony Russo and Joe Russo are directing Avengers: Infinity War Part 1 and Avengers: Infinity War Part 2. Marvel could also be using the morning talk show to announce cast members for future movies such as Captain Marvel, who is rumored to show up in Avengers: Age of Ultron, but we can't say for sure at this point.

It's also worth noting that the announcement will come just hours before a new episode of ABC's Marvel's Agents of S.H.I.E.L.D., and a few days before Marvel's Daredevil debuts on Netflix. Could the studio be announcing a connection between Avengers: Age of Ultron and these TV shows? We'll find out tomorrow, but until then, take a look at the tweets from Robert Downey Jr. and Good Morning America below, to see if you can decipher this new mystery.