Mitosis will launch first Matrix vault with their partner (Theo) in few hours (March 13 2025, 4PM UTC).
Eligible users for phase 1 can diposit weETH or miweETH to the Matrix in Ethereum mainnet, Arbitrum and Linea chains.
Phase 1 cap will be 3000 weETH/ miweETH.
Ethereum: 800
Arbitrum: 600
Linea: 1600

Useful links to read: 
1- https://blog.mitosis.org/blog/theo-matrix-campaign
2- https://docs.mitosis.org/docs/category/theo-campaign
3- https://docs.mitosis.org/docs/learn/matrix/theo-matrix-campaign/faqs

You can see the eligibility criteria for each phase in: https://x.com/MitosisOrg/status/1895631052879904897