We know that the ride has to be re-tracked as it was coming to the end of its useful life. However, that doesn't mean we should discount the fact that marketing comes into it (as it always does!). I agree with Skyscraper in that the potential to be able to market some sort of re-theme to the ride still plays a big part in ok'ing the overall project.
Now I may get shot down here for a controversial view, but stick with me. I think as enthusiasts we often over-exaggerate the overall importance of Nemesis to the occasional visitor. Anecdotally, if I get into conversation about Alton Towers with my none regular visiting friends, other coasters like Oblivion, Rita and even Air (they'll still call it that!) will come up in conversation before Nemesis does. I'm not denying it's not a great ride and not well loved, but I think we can often over-egg its status among the general public.
We now as good as know there will be a retheme of some sort to the ride, there's too much evidence pointing toward that being the case. The track colour, the actors around the ride at Fireworks on the Sunday and the intentional eye effect on the announcement video all point to the introduction of something else into the ride's lore when it comes back next year. Not to mention John Wardley's own words in an interview with
TT/Attraction source which also suggests some differences will be seen:
Come 2024, the park will want to shout about it reopening, to encourage guests to visit the park. Simply saying "it's back open, it's the same thing" simply isn't going to cut it. They will want to see something new and fresh to push out there, and based on everything we know so far - that's looking to be the case.