This is something I really don’t see happening for the GT series: themed updates. They always look for variety. The cars in a GT7 update are all unrelated to each other on purpose.
Sure, sometimes things like two or even three cars from the same brand can happen, for example. But these cases aren’t enough for it to be considered a themed update in my opinion, because there’s always that one extra unrelated car after all.
In fact, there are only two cases I can see something along the lines of a themed update happening: a new GT500 trio from recent years and a Lotus comeback. But on the other hand, I’m not seeing both of these cases happening for a GT7 update, but instead for a new game.