I heard that later this month Premium Plus will be announced and made available. The lab has let out a few hints about what it entails but they are guarding the full details until the announcement. This is my best guess as to what it will entail, based mostly on a video of one of the UG meetings: https://dreamersvirtualworld.blogspot.com/2022/04/premium-plus-is-coming-in-may.html
Of course this is only guesses on my part and nothing official. I believe that we wont get any additional premiu
You cannot downgrade account types without correcting the land situation on the account first. For example, going from Premium+->Premium you will have to make your mainland or Linden Home holdings 1024sqm or less or you will not have the option. Alternatively, if you keep mainland that is greater than the 1024sqm allotment, you will be tiered up. Going from Premium->Basic, you cannot have any mainland or Linden Home holdings on the account, the same and it will not give you the option t