One more question, when was last time solus iso updated the one on the solus webpage?
March 2019. If there was a new one, we'd have a new release. If we had a new release, we'd have an announcement about it.
Is there any dev iso build atm?
We sometimes will generate ISOs to validate certain configurations and stack upgrades against unstable, but none which are freely available.
Are there any daily builds?
No and that'd be overkill.