Reed Linden said today that the lab should be announcing more details about Second Life Premium Plus later this month. It sounds like the lab are ready to finally announce something very soon.
I personally think this will be a big interesting package of new benefits for Premium members. At this point no official details have been published as to the context of it all.
Premium Plus has been pushed back in recent years (uplift etc) until the 2022 roadmap was released. The lab have been working on it and it will be good to see the details of Premium Plus once it becomes official like the content, costs and further additions.
Keep your eyes open for blog announcements later this month. I’m sure we will hear something by the latest before early April 2022.