Celestia's official post states that Shwap, the first planned upgrade to the Data Availability (DA) network, has now been activated on the Arabica and Mocha testnets with celestia-node v0.18.2. Shwap makes DA sampling 12 times faster and reduces storage requirements by 16.5 times, thus supporting larger blocks and smaller nodes. After further testing, Shwap is expected to enter the mainnet beta phase in November.