Celestia launched its testnet Mamaki in May this year. . Mamaki’s upgrade is scheduled for late October 2022. Note that Mamaki is not Celestia’s incentivized testnet, it is planned to be closer to the mainnet.
If you want to miss the Aptos Incentive Testnet airdrop, you may wish to pay attention to celestia’s Incentive Testnet. According to our understanding
The incentivized testnet will be launched in the first quarter of next year, and the mainnet will be launched in the second quarter of next year.