Prusa is going to use Bondtech's upcoming INDX system, which swaps out the entire filament path.
Bambu Vortek seems to just be swapping nozzles so, while that should cut down on waste, it's going to be much slower (XL is already much faster than AMS based printers but comes at a substantial price increase).
INDX tool changes are expected to be around 8-12 seconds. Vortek would be probably be around 30+ seconds.
Interesting, yeah. I'm mainly interested in making multi-material faster without upping to the size of an XL, so it looks like the Prusa solution would be a better fit for my needs personally.
If Bambu are only swapping nozzles it also means they still need something AMS-like to swap the filament path, which somehow feels a bit clunky. I think having seperate filament paths is overall a cleaner and simpler design.
Someone's made an animation of how they think it'll look like: https://www.youtube.com/shorts/YNSlx0GJ5Ig
No need to speculate, Bambu posted a video of their design:
https://youtu.be/rluJj3NEdQA