I have a pair of Front-Roller Plus' and pair of Back-Roller Plus' (some intermediary version of QL2-QL2.1).
The newest version panniers have numerous improvements to the previous generations.

Ortlieb has made upgrades to the various hardware components and I specifically recall reading about a new plastic formulation that addresses the rack abrasion/paint damage issue. For the current incarnation of Sport-Rollers their website states, "new Anti-Scratch Upper hooks, lower hook, lower hook rail".

Here's the ad copy for the new Lower Hook: "If the lower locking hook of your Quick-Lock2.2 system breaks or goes missing, this spare part provides an easy replacement. Designed for compatibility, the QL2.2 locking hook not only fits bags with the Quick-Lock2.2 system but can also be retrofitted onto bags with older mounting systems. With an adjustable range of 10-18 mm, this lower QL2.2 locking hook offers greater flexibility than its predecessors. Additionally, it features an anti-scratch coating at the contact points, helping to protect your gear and bike frame from wear and tear."

I got a couple of those as well, used today for the first time.

My back rollers have an older version of the Stealth auxiliary strap (it's the strap that's attached to the face fabric with a screw and it wraps over the top of the bag's rolled closure and clips to a female buckle located in the middle of the bag's upper rail. That female buckle is attached via a very short piece of thin webbing so it flops around and inevitably falls down into the small gap between the pannier and the rack, requiring me to try and get my finger down in the small gap and fish it out in order to be able to clip it. It's my most used closure method 80% of the time (urban use, errands commuting, grocery shopping, etc.).
The newest version 'Stealth auxiliary closure strap QL2.1, black' (https://us.ortlieb.com/products/stea...ap-ql2-1-black) is redesigned and they eliminated the webbing so the previously floppy female buckle is now rigid, mounted to short stiff plastic stalk, is always accessible, is oriented vertically and slightly angled to ergonomically receive the male buckle. I bought a couple of the new Stealth Auxiliary straps and used it for the first time this week. The 'lost' female buckle problem is now history.

There's a bunch of other improvements. I wasn't aware that they sell an accessory locking upper hook with a key (QL-2) that locks the pannier to the rack, including a keyed-alike pair version (https://us.ortlieb.com/products/ql2-lock).