On the twitch stream last night Alan said that ATS and Gu Studios would be releasing a 745 / 755. Not a lot of other information was forthcoming at least for the bit i watched https://www.twitch.tv/videos/986279967 Announcement is at about 8 mins 50 seconds.
For those who might not know what they are https://en.wikipedia.org/wiki/British_Rail_Class_745 https://en.wikipedia.org/wiki/British_Rail_Class_755
Interesting. This will be worth researching, but I'm going to guess this is going to be one of those pieces of payware because there seems to be demand for something besides the Desiro replacements.
https://www.facebook.com/gustudios.co.uk/posts/1013369732798547 Or if you don't have FB: "It's been a while so here's a quick look at the 745/755 with some basic external texturing - interiors are currently being worked on."