We will do our best to release it as soon as possible. Currently, we are also working on 6.9 update which will provide some significant changes and improvements to the Host authorization system and also introduce a 2-factor authentication.
The amount of time this has dragged on has left me of the opinion that they have no intention of ever releasing a Mac version. There's never been any evidence that one is in the pipeline and any enquiries are fobbed off with the usual "coming soon" bulls**t.
I'm sorry the lack of Mac support is not available yet. Currently we are preparing the 6.9 version for open beta - among other improvements, namely with speed and performance, this version will also get two-factor authentication.
Mac support is the next priority after we release version 6.9. As for ETA, I'm not sure I can give any estimates - far too often they were incorrect in the past due to various reasons.