2. = Correct. Per
WoH T&Cs, having an active Hyatt CC gets you Discoverist. A US$50K spend or more is needed per calendar year, to get Explorist, which is the highest tier you can get with the CC. Note, also per T&Cs, that CC points are counted as "bonus" points, not base points, so they will not count towards tier or lifetime status.
3. = Per various threads and sources, your Globalist title will be extended another transition year until March 2019.
HOWEVER...you will not receive another set of 4 suite upgrades in 2018. It is also unclear what other "benefits" you may or may
not receive in 2018, as a Globalist-lite. Although it seems pretty certain you'll still get a free bottle of water, daily.
AFAIK,
everyone must complete 60 nights or 100K base pts. once WoH launches, in order to receive full/all Globalist benefits and rewards going forward; no getting around it.