Hi,
Thanks for using our product.
At first, I can assure that JA K2 Filter works with K2 2.7.0, as you said on your post, basically K2.7.0 main changes was the design on backend. I have made a quick test on it, but if you get any problem you can post in forum here and we’ll help you to resolve it asap.
The latest version of JA K2 Filter was released in Oct 2015. We are working on better backend UI for our extensions and K2 filter will also be updated for the same in the coming time.
Let us know if you have any feature in mind, which would be beneficial for other members also and we would gladly consider the same.