You would get 2019 points only. The resort doesn't officially open until within December so all UY are getting 2019 points (except February which is starting with 2020 because of when the resort was declared).
No, but December 2018 UY points are available with Aulani direct purchase. No MFs for the 2018 pts either! Incentives are very aggressive right now for both Aulani and Riviera...I added on at both with December UYs