An official announcement is expected on Wednesday.
Star Wars Battlefront II: Celebration Edition

Though it hasn't been officially announced yet, and may not be until December 5, it looks like EA is readying a new release for Star Wars: Battlefront II. It's called Star Wars Battlefront II: Celebration Edition and, as you probably already expect, this release will include the game, all of the previously released free content, a bunch of appearance unlocks, and yes, even some Rise of Skywalker content.

It's probably worth noting here that the Rise of Skywalker content won't be added until December 20, 2019. In addition, the write-up blurb about the game points out that content released after December 20th is not necessarily included in the Celebration Edition. That is to say: If there's more content it may not be free but you can probably buy it if you want.

This new release seems to have been leaked via TrueAchievements, though where they got the information from isn't confirmed. The Celebration Edition includes some new box art, seen above in full, along with the following content. The image shown above was apparently seen as part of a PlayStation Blog entry that was quickly pulled. It is very likely that this is also where the below information also came from.

Be the hero in the ultimate STAR WARS™ battle fantasy with STAR WARS™ Battlefront™ II: Celebration Edition! Get STAR WARS Battlefront II and the complete collection of customization content acquirable through in-game purchase from launch up to – and including – items inspired by STAR WARS™: THE RISE OF SKYWALKER™* when they release December 20, 2019.

The Celebration Edition contains:
  • Base Game
    • Including all past and future free game updates as they release
  • More than 25 Hero Appearances
    • Including six Legendary Appearances, plus one Appearance each for Rey, Finn, and Kylo Ren inspired by STAR WARS: THE RISE OF SKYWALKER, coming December 20
  • More than 125 Trooper and Reinforcement Appearances
  • More than 100 Hero and Trooper Emotes and Voice Lines
  • More than 70 Hero and Trooper Victory Poses.
Put your mastery of the blaster, lightsaber, and the Force to the test in Capital Supremacy’s massive, multiplayer tug-of-war. Battle alone against AI foes in Instant Action. Play together with friends through exciting Co-Op missions. Partake in large conflicts on iconic planets and with characters across three STAR WARS eras. Additionally, starting December 20, 2019, experience intense battles on an exotic new battlefront with Reinforcements inspired by STAR WARS: THE RISE OF SKYWALKER. Celebrate two years’ worth of free updates and content since launch alongside the game’s thriving community. Live out the STAR WARS battles of your dreams. Heroes are born on the battlefront. *Customization content released after December 20, 2019 is not included in the Celebration Edition.
As mentioned, this release hasn't even been announced yet. I'm sure there will be more details once it's officially revealed including price and platform availability. This also includes finding out whether or not this updated release will make its way to Steam for the PC crowd or if it will continue to be an Origin only title for now.