According to Shenzhen TechFlow, Starknet announced that it will soon launch the Cairo validator, opening the door to Layer 3 application chains on Starknet. This will make verifying Cairo proofs on Starknet cheaper and with lower latency. The team has successfully verified the proof generated by Stone Prover, and further optimization is in progress. This will expand Cairo and Starknet applications and enable new Cairo/Starknet L3.