Hello @keiji.d.imai, @stiebel, @Armin and @Felipe ,
Thank you all for your your patience here – I completely understand your frustration with not knowing what to expect in the upcoming year. It sadly took us (I mean, me) quite a bit longer than we hoped it would but we do have an answer now with the draft rules released in a separate thread:
I am happy to answer any further questions you might have but in short, we will use the orange golf ball(s) and will decrease the size as well as weight limit to 18 cm in diameter/height and 2200 grams in weight.
Should you have any further questions, I will try to be much more responsive.
Thanks!