I found this on the Bushnell website. It is an excerpt from literature for the ERS and XRS.
I think it's clear that Z-Lok is the turret on the new ERS and XRS which includes the turret lock from the DMR with a zero stop... so it's been out for 6 months or so.
"Special Note: Scopes Equipped with the Z-Lok™ elevation turret
If your scope is equipped with the Z-Lok zero stop elevation turret, the scope’s windage and elevation controls are positioned in the
center of their travel at the factory. This will allow a minimum of 15 mils (or 50 moa) of reticle travel in the up or down direction on the
elevation turret. The zero stop is not set at the factory, and will not interfere with reticle travel in the up or down direction. Use of the
zero stop is optional and the scope will operate normally with the Z-Lok remaining at the original factory set position.
If you decide not to use the Z-Lok, after zeroing your weapon please refer back to the instructions on page 6, which will help you to
re-index your turret(s) to the zero position.
If you would like to engage the Z-Lok after zeroing your weapon please proceed to the next section."
So to answer the OP's question, yes, I have the Z-Lok on my XRS and it functions as designed.
The ZS has been challenging to get set for a few Hiders but I had no problem; I followed the instructions to the letter and it worked.
There is a bit of slop in the turret that is inherent to the sliding lock system on the big ET scope turrets. It was present in the DMR (I have one of those and have setup 3 others) but with the DMRs 50 clicks/rev it was less apparent; with the XRS (and I imagine the ERS) 100 click/rev turrets, there is enough slop at each click to make visible determination of the turrets position a little more challenging at times. Once the turret is locked, the ambiguity is gone.
I like the turrets, myself.
Joe