Actually, nobody knows exactly what it will be excepted that it should have 20" wheels and that its name should be G-line with maybe G for gravel, the picture of the tests bike (but its from October 2023, so it may be very different now) show a bike with Schwalbe G-one 20" gravel tires tires. There could be an e-assist version of it ???
The main question is: what will it be?
If its like the current 20" clones (I prefer "clones" than tri-fold because there are many other types of tri-folds than the Brompton way of folding: Birdy, Vellobike, Iruka, Tyrell Ive, Helix, Caracle-S... are all tri-folds), it will be much bigger folded than the current Brompton, a major drawback for the current Brompton market.