Answered your own question there, the initial launch is all about getting it out there so the "trainset brigade" are the ones it is aimed at, because they are the ones that will buy in larger numbers initially. I doubt RMWeb members will constitute a large percentage of sales, especially as so many have felt the need to say that they aren't interested in it! So perhaps the choice isn't odd!
As for the rest you need to read the rest of the catalogue, for a start a Black 5 is mention in Phase 2, no doubt others will come along in due course.