While the original featured a little digi-gladiator action, the new film promises even more.
Legacy director Joseph Kosinski showed off concept art at Comic-Con that boasted a huge arena with shifting game grids that slide and combine as players are de-rezzed and knocked out, until only two are left to battle it out.
It's like a moving, live-action version of a tournament bracket - and the battles need to feel as vicious and visceral as they did in the original movie.
Come on, like they weren't going to feature possibly the most iconic vehicles in CG cinema history?
If the evidence of the concept art and the teaser (see it here ) is anything to go by, the designers have done the smart thing: building on the originals and making them cooler and more 21st century (jumps, jinks, curves).
We'll get to see both a second-generation bike belonging to Jeff Bridges' Flynn and a fifth-generation vehicle, as well as off-"road", four-wheeled vehicles.
The Maze must return, too!
The man who played Tron himself (and Alan Bradley, his human-world creator) is a definite must for the new film.
And - spoiler alert! - it looks like the filmmakers for Legacy are indeed planning to honour the idea.
While there's no clear word on how much screen-time Bruce gets in the new movie, we definitely heard Boxtleitner's voice in the scene from Legacy played at Comic-Con.
A Return To Flynn's Arcade
Kevin Flynn's (Jeff Bridges) '80s hangout - a bleeping neon, gaming cathedral crammed with kids and soundtracked by a rockin' jukebox - is one of the most important locations in the original, so surely there's a nod?
Again with the spoiler alert! The scene we were shown in San Diego sees Garrett Hedlund's Sam Flynn turning up at a dark and dusty Flynn's, only to kick the jukebox into gear and light up the machines.
Damned impressive. The '80s kid in us hopes the movie will kick off a second wave of 'amusement' arcade culture - 2010 is pretty much the 25th anniversary of the coin-op crash.
A David Warner Cameo
While Sark, MCP and Dillinger (all played by Warner in the original) were defeated or jailed, and it's unlikely that the new movie will feature a return from any of them, we'd love to see Warner involved in some way, even if it's just a vocal cameo.
The man is a genre legend and he's a big part of why the original is so much fun.
So far, the signs are good, with the producers clearly keen to focus on a progressive upgrade while smartly referencing everything that made the original great.
If they can find room for Boxleitner, they can find room for Warner. End of line.
Shiva is the huge, complicated-looking laser that deconstructs Kevin Flynn in the original and transmits him into the computer and onto the game grid.
While the laser's manufacturers - the evil ENCOM company - looks to be making an appearance in the film (according to spy snaps from the streets of Vancouver) we're hoping it's Shiva that Sam Flynn uses to dive into the world of Tron.
Probably a good idea to upgrade that block-by-block, '80s music video-style disintegration/materialisation CGI, though.
Easy On The Dance Belts
The Tron uniforms became legendary costume party options.
One man became an internet star by designing and building his own.
But we hope the concept art/footage is played out and the producers have seriously updated the unflattering looks of the suits.
Nostalgia is all very nice, but the leotard look just wouldn't cut it today. Unless they're secretly making a spoof...
An Updated Tech Score
The future-noir pop-synth score (created for the original by Wendy Carlos) is one of the original movie's defining features. So we really hope the sequel honours it.
The producers are certainly going the right way - hiring Daft Punk (confirmed Tron fans themselves who cite the film as an inspiration for their look) to compose fresh tracks for the movie.
They've apparently already penned 24 songs for the soundtrack.
Be nice to see them crop up in in a cameo, maybe in robo-suited Electroma guise...
No 'Re-Imagining' Of The Original
Too many movies take the original idea from an older film and try to twist it into something new and relevant to current culture.
Here's hoping the Tron Legacy team are aware that this rarely works and just pisses off fans of the original pics - who, 'fanboy' sneers aside, are the crowd who will push the flick from cult hit to mainstream smash.
Thankfully, everything that we saw at Comic-Con points towards Legacy being a proper sequel that keeps the first movie's plot intact and uses it as a jumping off point to tell a new story.
Better Female Characters
Don't get us wrong - we love the original Tron with a passion.
But it's very much a boys-and-toys film, with Cindy Morgan's Lora/Yori serving as little more than window dressing or token damsel-in-distress.
To avoid alienating half their potential audience, the producers need to focus more on counterbalancing the tech and testosterone.
With luck, Legacy female lead Olivia Wilde (above) will get a lot more to do (we hear she's been gifted with a few high-kicking action scenes).
What are your hopes and fears for Tron Legacy? Speak below!