According to the Starknet community, Cairo2.7.0 will be released soon. Currently 2.7.0 -rc.3 is available and can be tested by the community. This release involves Sierra upgrading to v1.6.0, which means that contracts written in v2.7.0 can only be deployed in Starknet versions 0.13.2 and above. The testnet upgrade is scheduled for August 5, and the mainnet upgrade is scheduled for August 26.