it is not defined yet. All options will be considered, thanks for suggestions.
Pre-mine is necessary for secure bootstrap of the network, due to its architecture.
In the beginning 100% the supply will be controlled by one sequencer.  It will be a fully functional network, potentially with many nodes, yet centralized. Worthless.
Then tokens from initial supply on the bootstrap sequencer will be gradually distributed to other committed parties who will run their sequencers
(or delegate to sequencers) and will start earning inflation and other income.
This will create liquidity of the token and the network will gradually become decentralized. Positive feedback loop between token liquidity and decentralization.
Not sure it can be called ICO, probably not.
The philosophy behind Proxima is cooperation among major token holders and social consensus.