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GrapheneOS is finally ready to break free from Pixels, and it may never look back
(www.androidauthority.com)
Icon base by Lorc under CC BY 3.0 with modifications to add a gradient
I don't know about releasing an actual phone but they've released closed source patches for testing. They have the code but they can't opensource the code until google does so publicly, so yes they've got a OEM partner.
https://grapheneos.social/@GrapheneOS/115164133992525834