There hasn't been any news, other than what has been already said. We are working on a fairly large update right now, but this is more related to a complete overhaul of how GSX objects are created, how they look like ( a lot of them have been remade entirely for PBR ), and how easy will be creating custom graphics for both vehicles and jetways, which is right now very complex.
The Pushback remake will be made at a later stage, and you can be sure you'll hear for us when it will arrive and, as I've said so many times in the forum, it will have interactions with many other things in GSX that use or will use user-customizable waypoint paths, like free walking passengers outside terminals, custom vehicle approach paths AND the custom pushback routes as well. So, it will all one coherent waypoint editor that will be used for all these services so, we want to do it right once.