Spring tins for 2017 have now been announced! They will be called the “Legends of Alola” tins and will feature either Solgaleo-GX or Lunala-GX. Those promos will likely be alternate art reprints of the cards included in the February Sun and Moon set, and were just recently fully revealed.
In addition to the promos, each tin will include four booster packs and a code card to unlock a deck in PTCGO. The tins will be released on March 17, 2017.