^Your wish has a chance at coming true. There's a Code Geass movie planned. If it features an original script (Possible) or a condensation of season 1 & 2, (Unlikely) then the Lelouch is alive theory is scrapped. But if it features a script that continues where R2 left off, then the chances of seeing an alive Lulu is high.
The "possible" above is because most movies for anime or manga usually feature an original script that isn't canon to the actual plot. So this can also apply to the Lelouch of the Rebellion movie.
The "unlikely" above is because there are already two OVAs that condense the R1 & R2 series into movie format. Not really a movie, but more like a recap with just a little extra material.
Still, since Akito is canon & ties in with both seasons, its possible that the movie can follow the same approach. For now, we'll just have to wait & see.
Source:
ANN.
As you can see, that article is now two years old & there's still no word, so I'm thinking the reason why they are keeping it hush hush is because the chances of Lulu reappearing is possible. But don't get your hopes too high, the movie can just focus on Suzaku or any other member of the original cast.
Not only that, but the movie doesn't even need to take place after R2, it can be another interquel like Akito or even a prequel from Charles' PoV. The possibilities are plenty.