As you know from experience, Evernote do not announce things ahead of time, but they've not indicated in any way that subscriber services are being downgraded - provided you are on v10 and not Legacy. Mobile services are necessarily slow to update since that has to be a low-key background task. Only suggestion would be to limit offline notes/ notebooks as far as possible, and leave the content syncing for as long as possible before likely use. Uninstalls / reinstalls are helpful because they make sure you have the latest version, but AFAIK offline notes need to be re-synced after each reinstall, so extend the time the device is left syncing...