So I emailed Rampage again and this was the current response:

Hello,
Thanks for getting in touch with us. We have not yet gone into production with any JK upper half door sliders. We are working on a more cost effective way to build quality pieces so they do not break the bank. We hope to have something in the near future but I do not have any type of ETA.
Thanks again.

Not looking too good...

 

Due to extremely low demand, I doubt you'll ever see an upper glass slider for JK.

 

I know but if my glass can't be full I would like to have at least a drop or two in it for hope?

 

Are you refering to roof-height tube sliders ? that protect the JK when leaning over. Ace make a pair of B piller sliders that bolt into the upper stock roll bar above the doors. I'm selling a pair cheap if you want ?

 

No he is talking about upper half door sliding window like this

 

Correct. Had them on my TJ and really liked them.