On May 1st, 2013, Caitlyn Taylor Love (voice of White Tiger) revealed that a third season is underway next year in 2014 as she has recently posted a video on Facebook of her and the other cast members lending their voices to the characters in the show.
With season 3 coming, there just might be a chance that Marvel is adding another member to Spider-Man's team. Most likely a female superhero and it is most likely to be the mutant super hero Daisy Johnson aka "Quake".
Quake us well known in the comics for being a member of SHIELD with super human abilities that allow her to manipulate earthquakes and tremors and as a new member of Spidey's team, she will be depicted as a teenager who goes to Midtown High school as well. And from the video of the season 3 voice overs, Quake is rumored to be voiced by Mae Whitman (Katara from Avatar The Last Airbender).
As for some of the villains predicted to appear in season 3, the Mandarin (Iron Man's arch enemy) is one of them. However, because of Iron Man 3's twist on the character, Mandarin may or will not be depicted as Trevor nor Aldrich because they both lack magic rings. Luckily there is one version of the Mandarin that Joe Quesada would really use that sort of fuses both Trevor and Aldrich together and this version appeared in the Invincible Iron Man comics #500-526 and the version of this Mandarin is right below in this picture
What's interesting about this version of the Mandarin is that he sort of resembles Tony Stark by wearing a business man suit like Tony except for
the long hair. He also runs own city in Mongolia called Mandarin City, named after himself. If the Mandarin does appear in Ultimate Spider-Man season 3, he is expected to be voiced by one of these talented voice actors
Miguel Ferrer, Corey Burton, Ron Perlman, or Johnathan Freeman. Surely some of you are expecting the villain's voice to be chinese toned but when it comes to villains like the Mandarin, usually it is best to go with voice actors with the barotonic accent as well as the voice needing to be sinister enough to fit the charater
What is really more interesting about this version of the Mandarin is that he is married to Justine Hammer/Crimson Cowl and has a daughter named Sasha Hammer. Those two women are also the daughter and grand daughter of Justin Hammer. Very surprising isn't it?
For a very epic battle in season 3 to take place, Joe Quesada may also include Iron Man 3's "House Party Protocol" also known as Iron Legion
If that happens as well, there is sure to be an all out war happening sometime probably before or by the end of season 3, and hopefully Spidey's teammates White Tiger, Nova, Iron Fist, Power Man and Quake may be able to wear some of them during their fight against the enemy or they may just be wearing armors of their own costume attires.
As for Iron Man and other heroes, some of them will be back too and new ones debuting into the series like Black Widow, Wasp, Ant Man, and other characters like Namor, Marrina Smallwood and perhaps other characters like Psylocke, a very popular Marvel character known for switching sides chaotically, she may even be featured as Lady Mandarin as well along with her brother Captain Britain and her lover Fantomex
As for other villains speculated to appear in Ultimate Spider-Man season 3 in time one of them is also sure to be a villain from the MCU and it is sure to be Malekith the Accursed
Malekith is yet to appear in Thor the Dark World as the main villain but it's unclear if Joe Quesada is able to intercept him in time for the third season, to find out stay tuned for more updates as they come