And one more piece of good news: The new package is now also used in openHABian.
The openhab2 package (the “online” version) will be installed on fresh systems. Nothing to pay attention to there.
If you are already using openHABian, just execute sudo openhabian-config, then select “Update” followed by “openHAB 2”. This will transition your setup over from the cloudbees repository to bintray and from openhab2-offline to openhab2. Just as @Benjy mentioned you will be prompted about 1-2 changed files in /var/lib/openhab2/etc. Select yes.