Sorry for the delay with 1.6. We are going to release it in June as soon as we prepare release candidate for 2.3. Most probably some of the open issues that you see in the backlog will be fixed in subsequent patches of 1.6.
Yes, as promised, we continue fixing bugs and add features to 1.x. Release 1.6.0 will be available in the next few weeks.
Regards,
Konstantin