The grapheneOS team has stated repeatedly that the fairphone does not meet the requirements for GrapheneOS, they are currently working with a hardware partner to bring GrapheneOS to a (supposedly) new device. This is most likely not fairphone because
Fairphone is not selling worldwide, the annoucement mentioned a worldwide partner
Fairphone does not mean the Hardware rwquirements and (arguably more importantly because it is harder to fix) the software requirements. They do not have timely enough upgrades.
The grapheneOS team has stated repeatedly that the fairphone does not meet the requirements for GrapheneOS, they are currently working with a hardware partner to bring GrapheneOS to a (supposedly) new device. This is most likely not fairphone because