Thanks for listing them all devel.bmad:
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SSS was disabled on all OpenGL platforms, as I discovered only recently - this has been added as JIRA UE-17816 to fix.
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Planar reflections on translucent surfaces will require further investigation - it’d be useful to have more detail about your expectations/use-case. Again it has been added as JIRA UE-17817 to resolve.
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Oculus support on Mac hasn’t been looked at in ages, there are JIRA’s for that already & I’ve added another (UE-17818) for the audio SDK. Unless/until Oculus actually restore official Mac support there will be a limit to what we can do.
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No idea about Leap Motion support - I’ve added JIRA UE-17819 but I think the chances of getting this are low.
Metal support for El Capitan is an on going effort; some extra graphics features will be possible and others will not. Until El Capitan & official, released support is in UE4 it’d be wrong of me to say anything either way as there are too many moving parts!