There was lengthy discussion of tithing in Israel, with a buildup to the extent that I almost thought they were going to suggest 10% donation or something like that. But no, they left donations voluntary.
PIMO friends tell me that their Cong just asked all Pubs to complete a written form that commits them to a monthly contribution. Said that this commitment is needed so the WTS will know how much they can depend on when considering foreign building projects (new KHalls hahaha) around the globe. No specific amount was suggested, but I expect the elders have been told what is "projected" to be contributed by each Cong based on cost per Pub basis, just like the assembly cost arrangement.