A new update to the Google+ app for Android has started rolling out, and should reach all users within a few days. Google+ 7.0.0 is all about giving people the most requested features since the big redesign last year, but also squashing some bugs in the process.
The bottom tab bar now automatically hides when scrolling (but not on the Notifications screen yet). The home stream remembers your position when you come back to it from a different screen, and the search function has gotten autocomplete suggestions as you type. If you have no Communities or Collections on your profile, then the app will prompt you to add one. Additionally, a grand total of precisely 69 bugs have been fixed, and 14 accessibility issues have been addressed.
More updates are promised for the Google+ app for Android in the near future, and you can influence what will go into them by using the Send Feedback menu item.