I'm expecting governments to start mining bitcoin soon so they can control it.
I can't imagine any government-backed currency to rely on PoW or even PoS. In my view, a state cryptocurrency should be:
1. either 100% premined, locking a share of the supply in smart contracts tied to macroeconomic indicators or with an adjustable inflation rate
2. auditable
3. transparent, i.e. no anonymous transactions
4. categorically DPoS or a similar multi-point consensus mechanism