The railway gazette article quotes two motored coaches (relevant bit quoted in
this post) although it's something that's been bandied around for a while,
this post quotes Jan 2020 Modern Railways with a 2 motored configuration.
Does seem surprising to install more diesel power and then reduce the number of motored axles - if they use the exact same motors as the other 80x, it gives them an installed 1808kW (continuous) for 2940kW of engine, which unless the motors have a far higher peak rating, would mean most of that extra power is pointless (and no chance of matching 22x timing). I suppose it might be possible that they've realised that can up the power in each motor as part of a weight saving drive (which starts adding up if they can put inboard frame bogies under more vehicles) but I'd worry about the ability to put the power down