This was posted by the guy behind the Tesla Android Project (https://teslaandroid.com/).

In summary:

• FSD stack is being tested in Europe as a regular Autopilot, it is intended to just replace the old stack and keep the same functionality; the work is still in early stages and will take some time
• radar in S/X isn't used now and it will be needed to homologate FSD in other markets
• Model 3, Model Y and Highland will probably not get radar
• the front bumper camera will appear in other models when Cybertruck launches or a little bit before that
• the front bumper camera will be connected with the same harness as the front headlights and other front equipment (mentioned in one of the following comments)