Well, of the photos we've been given, one is a Google Maps image of what they want to create and the other 14 are of the Citaro in the same place on the map. Given they're trying to sell a map here, they seem strangely reluctant to show the progress on this map that's releasing in 2 months.
The most shown off of the map in the screenshots is this:
I'm seeing here: terrain painted with default OMSI texture, default Spandau building to construct a big Hotel/Office building, default bus stop shelter, street lamps and repainted default bus stop flag and one of the terrain splines packs use to create pavements. If this was a freeware map, it'd give it top marks for being a nice generic-German map, but I'd expect some more custom content for a payware map (see Hamburg and all it's unique junctions and textures), especially given this is meant to give me a Swiss feel.
Looking at the Citaro, it does appear at least to have a different centre of dashboard, some other new cab electronics and a lunchbox holder on the left side, but other than that it's a Citaro like the rest of them. It being a mod of an existing freeware Citaro would be nice, but I guess you can't do that with a payware addon.
I'm looking at pictures of buses in Luzern on Flickr and I'm seeing all sorts of really interesting trolley buses on other lines in Luzern:
And if you wanted something that would actually be fully supported in OMSI there's more current (left) and slightly older (right) options, both of which I'm not sure I've ever seen in OMSI before:
But instead we get another Citaro, of a type I can barely even find a picture of in Luzern...
Maybe when they show some actual screenshots of the map (the main premise of the addon existing at all) I can find something (perhaps the advertised "original textured buildings and objects") to relieve it of it's "yet another Citaro" status.