Characters will be wiped between phase 3 and phase 4. If you have a ver. 1.0 character you will start phase 4 with the lvl you had when 1.0 ended. If you do not have a ver 1.0 character you will start phase 4 at lvl 1.
The plan is to not wipe characters after phase 4 unless they need to. Phase 4 will end and a few days or longer will pass before the early access starts. All progress made in phase 4 will carry over to the early access (unless they determine they need to wipe progress for some reason). All progress made in early access will carry over to offical launch.
Those with early access are suppose to receive an email before with instructions on how to get into the early access phase.