According to the English translator at the official Bandai Namco stream that revealed the new movie teaser and Dragon Ball Legends, "he is actually the Super Saiya..." (and then paused). Implying that he has the Super Saiyan transformation and the translator made a little spoilery glimpse: https://youtu.be/jvwJWwaUoX8?t=1h17m38s 20:02, March 23, 2018 (UTC)
According to Kanzenshu translators who got onto a livestream, the new saiyan is apparently called Shallot,
this livestream apparently
I cant find an archive, but it was brought up by user GuanYu on Kanzenshuu's forums
Shallot's Rage Empowered Form
Rage power up name
If we go by DBS: Broly shouldn't shallot's rage form be Wrathful as both have that great ape relation?
So, i guess have some mistakes in the Techniques and Special Abilities, how you can see in that video: https://www.youtube.com/watch?v=LLB39r65Fd4 Shallot actually dont posses attacks like Darkness Twin Star, Death End Attack, Shoot Blaster and Fierce God Slicer, but attacks he actually have and arent listed are:
God Heat Flash Learned from Super Saiyan God Vegeta
Heavenly Arrow (Which is called Fierce God Slicer in the game) Learned from Future Zamasu
Death Blaster Learned from Chilled
God Big Bang Attack Learned from Vegeta Blue
Omega Blaster (Which is called Blaster Shell in the game) Learned from the Second Legendary Super Saiyan Broly added in the game.
Also, the Justice Rush learned from Great Saiyaman 1 is basically the Ultimate Kamehameha RebirthArtOFC