A couple more photos have been uploaded, one showing the Class 360 (presumably to be included), one of Stratford and one of Ipswich. They've also uploaded a map showing what will be covered in the route, which will be Liverpool Street through to Ipswich, the Braintree branch, Colchester Town branch and also the Port of Felixstowe branch.
Incidentally, users on UKTS have been saying that it's a shame that the 321 isn't (yet) being developed for the route. Indeed a 321 would have been nice, not only for this but also for the Crouch Valley and Mayflower Lines and, with a reskin or two, could easily become a 320 for use on Edinburgh-Glasgow and WCML North routes.
However, with Waggonz's Class 90 & DVT nearing completion, and classes 153, 156, 170 and 379 (reskin of 377) available, as well as 66, 70 and 86, I think we're relatively well equipped in the meantime. There is also the freeware Class 317 available in a number of liveries, which could be a substitute for a 315. Not ideal, I know, but not the end of the world.
Nevertheless, i'm looking forward to this. I hope they do a good job with the 360 (as good as the 377 I hope) and if Waggonz's Class 90 pack is as good as their 142 pack, that'll be great as well.