The fact that DTG has essentially disappeared (over the past year) as an add-on developer and that the MR project has failed might suggest that the August 25th announcement is based on something else entirely.
Of course, Tsw7 (or whatever it's called) will also be relevant, as several add-ons have already been announced previously.
The possibility that the "Direct" is about to follow the pattern of past years (i.e., DTG developing three routes and three trains) seems a bit suspicious to me.
Although, truth be told, DTG has an innate ability to build suspense and, immediately after, an equally adept ability to surprise with stunning announcements (in a weak sense, I mean).