iOS 9 upgrade question
The latest, currently 9.2
It ought to drop the older version &amp; download the new, as it's released.

If that failed for any reason, then it would fetch the latest immediately [or soon] after you upgrade.  

The simplest &amp; safest method is always to do it via iTunes, assuming you already have iTunes linked to the phone.


Connect the phone
Download the update but don't install it.  
Sync the phone with iTunes.  
Switch to the Apps tab &amp; get all pending updates.  
Sync again.  
Backup.
Disconnect &amp; reconnect, then when it asks, run the update.