SPOILERS For "The Avengers: Age of Ultron"

Production on Joss Whedon's superhero team up sequel "The Avengers: Age of Ultron" continues.

Latino Review has posted what appears to be details about the film's opening 15-20 minutes.

The sequel DOES NOT follow the Age of Ultron comics storyline--in which the big bad Ultron was created by Hank Pym who becomes Ant-Man. James Spader will both voice Ultron, and he'll have to do some kind of motion-capture as well--This news puts to rest the most popular theory suggesting that Tony Stark's (Robert Downey Jr,) robot butler J.A.R.V.I.S. (voiced by Paul Bettany) operating system from the Iron Man Films would turn into the villain.

Marvel vets RDJ, Chris Evans Chris Hemsworth Scarlett Johansson Samuel L. Jackson Jeremy Renner Mark Ruffalo, Clark Gregg and Cobie Smulders are all expected back Two time Iron Man co-star Don Cheadle is involved this time out according to USA Today. Bettany will appear on screen as The Vision an android created by Ultron as a weapon to be used against the Avengers. Vision can fire beams of radiation and turn invisible--the character ultimately turned the tables on Ultron and became an Avengers member himself.

TV's Hulk Lou Ferrigno has confirmed that he'll return to do the voice of the big guy in the sequel. Ferrigno has said four words as the character so far - "Hulk Smash" in 2008's "The Incredible Hulk" and "Puny God" in "The Avengers".

Thomas Kretschmann has landed the role of 2nd bad guy Baron von Strucker. In the comics, the seemingly immortal Strucker is one of the leaders of Hydra, and an enemy of both S.H.I.E.L.D and The Avengers He seemingly beat out rumored candidates Marton Csokas and Dougray Scott who were being considered for the BvS role. The character will have Wanda Maximoff, a.k.a. Scarlet Witch (Elizabeth Olsen) and her twin brother Quicksilver (Aaron Taylor-Johnson) apparently working for him in the sequel (American Horror Story favorite Evan Peters plays a different incarnation of the speedy superhero in Bryan Singer's "X-Men: Days of Future Past"--in a very cool sequence in the film). Korean actress  Soo-hyun Kim will play a bad gal role.

Radar Online has an unidentified source that claims that RDJ is campaigning to get his pals Mel Gibson and Jodie Foster a role in the movie.

Here are the deets in an excerpt:

SPOILERS AHEAD

"The opening set piece has The Avengers attack that rogue outpost Hyrda cell run by Baron Von Strucker. He has  Loki's staff and also possesses Chitauri weaponry. The Avengers are there to basically clean it all up. But that's not all, Von Strucker also has the corpse of a  Leviathan. Quicksilver and Scarlett Witch fight alongside Von Strucker against the Avengers. The Scarlett Witch uses her powers and cast a hex on the Hulk into thinking that the Leviathan is still alive. It's safe to say some serious Hulk smashing ensues. Eventually The Avengers win, capture the staff and the bad guys. The team then goes back to Avengers Tower and have a party. The whole team takes turns trying to pick up Thor's hammer Mjolnir...Rhodey is in this scene by the way. In the party scene we discover that Banner and Black Widow kinda have a thing for each other. Banner is afraid to consummate anything with her for fear of hulking out and hurting her. Very Buffy and Angel stuff. Very Joss Whedon. But that is not all. We also learn in the party scene that Jane is no longer with Thor! The poor Asgardian is at the bar watching Jane (Natalie Portman) with Richard (Chris O'Dowd from Thor: The Dark World). Supposedly, he is ok with it. He's fine. Supposedly."

Some non principal filming took place in South Africa Production on the 'Avengers' sequel continues to meet a release date of May 1, 2015.