If I’m going with this definition of “end game”, from the OP:
Then I am at my end game, which is detailed here as of this week (pending delivery of my currently-being-built ZMF Vérite Closed, and running my NOS WE300B/274B in the WA234 MKII instead of the Takatsukis).
There is nothing currently either shipping or in development (that I’m aware of) that stands to change this. And any future changes would simply be seeing how far I can simplify and reduce this setup to get it to as minimal a state as possible.
The Jotunheim R and the HEDDphone were the last pieces I needed to close out the “potentially game-changing stuff I know of and that’s coming-soon”. With their arrival, there’s nothing on the horizon I’m looking forward to.