Achieving Titanium via 3 brands is great for me as there are numerous brands in NZ and all fairly cheap. However I don't think Titanium itself will come with too many real benefits (room upgrades, late check-out "subject to availability") though I like the idea of using a hotel's facilitites even if you are not staying there.
I suspect that Discovery Dollars (D$) is where the real benefits will lie, and that will require $$ spend. I am thinking they will give you D$5 for every $100 spend, with uplifts for elite status (maybe, 25% Gold, 50% Paltinum, 75% Titanium), but that is just a pure guess. Also, I wonder if they will do regular promotions for extra D$ like Marriott, Hilton and IHG?
Local experiences may stay, but I suspect they will have a $ cost attached to them which you can use your D$ to pay for.