How long will the premiere edition stay?
Good question that probably only Google itself know.
As the first Premiere edition was available for a long time I would assume the same for the actual premiere edition. I also guess that Google would advertise when they are planning to take it off from the Store to give everyone the chance to buy it before it leaves the Store. So if you have News enabled for the Google Store you should be on the safe side to not miss any news regarding that.
Good question that probably only Google itself know.
As the first Premiere edition was available for a long time I would assume the same for the actual premiere edition. I also guess that Google would advertise when they are planning to take it off from the Store to give everyone the chance to buy it before it leaves the Store. So if you have News enabled for the Google Store you should be on the safe side to not miss any news regarding that.