There was never really an announcement for Version 6.1.0 of the Blender exporter, other than a post at the end of a long topic, & and a tweet.
There has been a minor update to 6.1.1 today as well, to work with slightly different names of properties in PBR between 4.0 & 4.1.
Here are both change logs:
Blender Exporter Version 6.1.1
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14 May 2019
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Support for exporting to either BJS 4.0 or 4.1 regarding names of properties, which changed names
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Make PBR materials the default
Blender Exporter Version 6.1.0
- 11 May 2019
- Added support for Subsurface, Anisotropic, Clear Coat, & sheen from Principled node for PBR
- Added tangents when also using custom split normals
- Added several generic .env files for when PBR is output
- Made changes reflecting the final API for Blender 2.80