A lil somethin somethin: You can find the details for this event on the announcement page here.
The Mac version of course supports full crossplay with other platforms, and you can purchase your copy either via Steam or via the Mac App Store.
We won’t keep you with a longer announcement than this, so we just want to leave you with a brand new trailer, made specifically for the Mac release:

System Requirements:
Minimum:
OS: MacOS 10.13 or later
Processor: 2.6 GHz Quad Core or similar
Graphics: Radeon Pro 450 or R9 M290X
Memory: 8 GB
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