n2gwtl Android laptop info has leaked recently.
I would expect that the GrapheneOS project would decide whether to support such a device after having possession of one, which I would expect to occur after they are shipped, which I would expect to occur after they are officially announced.
I would not expect that the GrapheneOS project would decide whether to support such a device based on rumors, leaks, or even pre-release press reviews. That just doesn't make sense to me.
Also, since Google has recently been slow to release source code for new devices, it might not be possible for the project to decide until months after the devices ship.