Herb Koch, president of the Chicagoland Lionel Railroad Club, has posted two videos and a slide show of the Base3 BETA testing at the CLRC.
The Day 2 video is the most interesting. Among other things, Dave Olson stated that, starting in 2024, ALL Legacy engines will have 4-digit addressing.
Lionel's Dave Olson and Andrew McCarter come to CLRC to test the new Base3 System. - YouTube