Starting with an international administration in 2023, then a PSAT 8/9 in the US in that same year, followed by a PSAT 10 and finally the SAT in the US, the College Board is delivering a completely digital test-taking experience.

The test will be closer to 2 hours, not 3. Here’s the official announcement https://newsroom.collegeboard.org/digital-sat-brings-student-friendly-changes-test-experience
My fellow tutors have also reported that it will be “adaptive” meaning that in some way, whether it’s question to question or section to section, student performance will be measured and the system will respond accordingly during the test: either an easier, equally difficult, or harder next section (or next question) will follow.