Haven't paid attention to iOS updates in a long while; my 5S is still sitting on JB 8.1.2
What are some of the major new features in 8.2, 8.3, and 8.4? Just wondering if it's worth it to upgrade or just wait until 9.0.
The biggest change is the new iTunes app in iOS 8.4, with Apple Music.
If you wait till iOS 9 is released, there may not be a jailbreak available for some time, leaving you stuck on iOS 8.1.2. Since there's a jailbreak available for iOS 8.4 right now, you may as well update before you lose your chance when iOS 9 is released.
BTW, make sure to do the restore through iTunes on your computer, after backing up your iPad. There's also a way to back up your jailbroken apps and tweaks as well.
In addition, since you're talking about a jailbroken iPad, I've moved your post to the Hacking Forum where it will receive more attention.
