EDIT 2: The scans of the magazine we got the synopsis from are now available on codelyoko.fr; 1, 2, 3, 4, in French of course. Nothing much new. The character profiles on pages 2 and 3 are on France4's site, or translated by me (because Google sucks) here. The fourth page is just an advertisement for the Facebook game. Page 1 has the synopsis we already have with a summary of the series so far, so it's not worth translating.
EDIT: Alright, we've got official dates!
There's the advance screening on the 5th of December where you have to be physically present to watch, then there's also one online on the 19th. It's on France4's site though and will probably be region locked.
France4 will then be doing regular airing of the show every week, with the season starting on the 5th of January with the first three episodes back-to-back. The next two dates we have are the 12th and 19th, and we're not sure if they'll be repeats of episodes two and three (which is likely) or episodes 4 and 5.
Five years in the waiting and we're almost there, just less than a month!
It was just a rumour but it's now been confirmed, Evolution will be released around the 21st of December, during the Christmas holidays.
We've also got a proper synopsis now, minor spoilers ahead. Going to refer to Xana as a he, like in the show. And I apologise for my rusty French, I haven't been exercising it enough.
What Xana wants is to steal the Source Codes planted in Yumi, Ulrich, Odd and Aelita. If he succeeds, he can finally get rid of the physical medium on which he operates; the supercomputer. He'll then gain absolute independence to live alongside humans and nothing will be able to stop him. It's for this simple reason that our heroes want to eliminate Xana before he achieves this goal. They must therefore infiltrate the Cortex, and destroy the supercomputer controlling it.
This replica of Lyoko, linked to their supercomputer, contains a unique sector. It's an immense circular platform at the centre of which the core is found. The floor of the platform rises, lowers, or moves on a system of earthquakes, so its surface is moving. In the sky there are floating islands. Like the vertical structures beneath the platform, these are mainly decorational elements, built for dressing up the place.
So there we go! Not sure what happened to Alan Meyer, maybe that's another spoiler and a bigger plot point, but we'll see.