Recently, it was announced by Tom, a Miiverse administrator, that Miiverse will be getting a major redesign. The redesign is set to happen sometime this summer. Two new features and post categorization are confirmed to be coming with the new redesign.
Screenshot albums are one of the new features that will be implemented into Miiverse. The albums can only be seen by the uploader themselves and up to 100 screenshots can be saved onto each album.
The other new feature is Play Journals, the confirmed replacement for Activity Feed posts. They will only be available for games that support the taking of screenshots.
After the update, posts will be put into 1 of 3 categories, Play Journal Entries, Drawings, or Discussions.
[Source: Miiverse Redesign Announcement]