Hey @Jessie appreciate the questions!
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Consensus mechanisms are being actively worked on as part of this sequencer selection RFP - the current leading candidate is called Fernet but we will have a decision here in the coming weeks.
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Upgrade/governance are actively being worked on as part of this upgrade RFP & again expect to reach clarity in Q3/Q4 of 2023.
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Validator staking mechanism, fees, and revenue - See #1 for the latest research (but generally all tbd!). I’d expect another public RFP here to get involvement/suggestions from all interested 3 parties.
Hope this helps!