Celsius did support the Spark Token airdrop for XRP holders. All users that had their XRP tokens on their Celsius wallet when the snapshot happened on December 12th, 2020 will receive Spark tokens when they are launched from Flare Networks.
The Spark token is from Flare Networks, which is expanding XRP's utility by scaling smart contract platforms without linking safety of the platform to the value of its token.
Please note that the Flare Network will not be up and running on December 12th so it will take some time before we can distribute the spark tokens, current predictions are that it will be live during the spring/summer of 2021.
Please check out the video below in which our CTO Nuke explains a bit more about this topic.