Any update to software that directly alters the drive train or affects the function of any safety system including ADAS requires Homologation in Europe. For America, this can be self-certificated by the developer, but they then are legally liable.
The cost for European homologation is €800,000 to €1M. Given the number of Fiskers in Europe, that could be around €1,000 each just for the legal requirements.
So unlikely you will see a full version 3 with Adaptive Cruise Control, Torque Vectoring or One Pedal Driving. Personally I would be happy to pay €1K plus for the above but I’m pretty sure I’m in the minority.
My guess is that the rumoured 2.5 version from IndiGO is version 3 with the above stripped-out plus bug fixes.