-In terms of cutscenes, the story is around two and a half hours long.
-The story features the option to play through story sections either as a solo character or creating your own team from the characters available. Certain character choices may effect dialogue before and after a fight.
-There are several unplayable characters being created for the use in Story mode, acting as enemy units for the player to fight. The first confirmed ones are the Asgardian soldiers seen in the first story trailer. The second is apparently a Rathalos from the Monster Hunter series.
-All 6 of the first wave DLC characters will be making an appearance in the story in some form, while the only character the player can actually fight is an incomplete version of Sigma.
-Zero is a part of the story mode, Johnny Yong Bosch apparently returning to voice the character. It's not made clear if he's a playable character.
-While Ultron Sigma is the main villain of the story, both Thanos and Jedah play pivotal roles as major antagonists in the story. These are the only unconfirmed characters that the two actually spoke of by name.
-X is the main character of the story mode for the Capcom side, and yes, he does have a voice actor. No names have been given for his English VA, but his Japanese VA is Takahiro Sakurai, his VA from X8 and Project X Zone 1 & 2.
The last thing I was allowed to ask them was in regards to the DLC and how they planned to handle the 6 initial DLC characters. They then confirmed that all the DLC characters would be coming out with two at a time, all of them planned for release before 2018. The first two DLC characters (Who we've already confirmed is Sigma and Venom) are set to release in early October with the other four following suit. Surprisingly, none of the DLC characters are actually complete at this point, the most a majority of them have so far is a model (which will be used in the story mode).
As for future DLC plans, it's apparently all up in the air. They definitely plan to have some details by the end of the year, but they've confirmed one thing...it will not be split into seasons like SFV. They claimed that the most likely option they're going to go with is themed character packs. They didn't say how frequent they would come out, but they really want to get out as many characters as they can by the end of 2018, especially since the SFV team apparently has some really big plans for 2018 and they need to compete for attention.
And that's it. Despite what happened with Ryce's leaks, the team is still trying to keep information on the roster a secret. Makes me wonder if it's possible that there's more to the roster than Ryce is letting on? Sadly, I can't confirm that, but I can definitely let you all know that they've already got their plans set for 2017. Expect alot at E3.