The Kaia mainnet will be a hard fork of Klaytn, and not a whole new mainnet. The Klaytn mainnet will continue to operate under the new Kaia name after the rebrand.
No, KAIA is a rebrand from KLAY. However, there will be some changes in supply due to the merger of Klaytn and Finschia. As such, we would recommend starting the token charts afresh.
Klaytnscope will continue to function as a block explorer for Kaia, but it will be updated approximately 3 months later to a new Kaia-branded name and URL.
There will be no functional issues other than a name discrepancy, but we recommend updating your wallet once you can to reflect the new name and ticker. If you are an ecosystem partner, we will be reaching out to inform you when the update should be made.
For DApps in the Finschia ecosystem to migrate to Kaia, a process similar to migrating from a Cosmwasm chain to an EVM chain is required. Additional migration support will be shared once available, but if you need immediate assistance please contact Finschia Foundation.