I just downloaded the latest version of Blender 2.80 (posted June 1st called a “Beta”) and took a look.
First think I noticed the “Collections Outliner” seems to have changed again. Gone are most of the little icons - only the “eye” remains. (See image below.). However, there are now check boxes that seem to disable individual collections.
I tried to export to a .babylon file with two versions of the Blender exporter (6.0.10 and 6.0.12) both throw errors and no export. - with all collections enabled and one disabled.
The full fledged release of Blender 2.80 is now due in July I gather (moved from June?).
I know Jeff is a very busy guy and has been putting a lot of time into PBR materials, so where is the exporter headed now?
And I still really like and use the ability not to export certain layers and would really like this for Collections.
cheers, gryff 
