Turbine wrote in May that the last sub payments would be processed on June 30th and that the game would become buy-to-play thereafter. Massively can confirm that logging into the Turbine account site and attempting to resume an old account currently allows players to select a "Lifetime AC Plan" for $9.99, which matches the buy-to-play price for all gamers who wish to play for the first time. Players who were subbed at the transition should be grandfathered in and will no longer be billed every month.
While both games will continue in maintenance mode, Turbine still plans to facilitate player-run servers this year.
[With thanks to Arpeggio.]