Sonic upgrade is a part of fantom's rebranding strategy. There are some points on what things will come to the fantom.

1. Rebranding, fantom will rebrand its name to the sonic blockchain.
2. Scalling, Fantom will increase its scalability through sonic upgrade by replacing the current blockchain. Expect sonic blockchain to have 2k TPS.
3. Fantom token's name will be changed to the S following the change fantom blockchain's name to the sonic blockchain.

Im not seeing sonic upgrade as something special here. It's only scalability upgrade after all. I don't see any potential. To be honest, as you can see that how the TVL of fantom never increase again. It shows it has not gotten the demand even after fantom released this announcement to implement scalability upgrade.