The Polkadot community has passed Proposal #1143 to transition from the previous slot auction mechanism to the Agile Coretime mechanism.
It is reported that Agile Coretime is a new parachain resource allocation mechanism. Unlike slot auctions, it allows projects to rent network computing resources (i.e. core time) through sales, thereby simplifying the allocation process, improving flexibility, and eliminating problems such as high costs and high uncertainty in the auction model.
In addition, in the latest proposal #1161, the community has voted to approve the detailed plan for Coretime sales, including setting the initial price and sales parameters. (PolkaWorld)