We just received an update from vtiger rep saying that the VTiger 7.1 Stable/GA version will not be released in January, 2018. Due to outstanding issues and fixed, the release has been pushed at least until March (not confirmed yet).
We should know more, possible have a set date for VTiger 7.1 Stable release on 3rd week of February, 2018.
Here’s an official post from vtiger:
We would like to update regarding Vtiger Opensource V7.1 GA. This version release delay as we need to address all the bugs those are reported in code.vtiger.com. We appreciate your patience and valuable contribution towards the release. We will confirm the release date in 3rd week of Feb month.