On July 18th, according to the Starknet community, Cairo 2.7.0 will be released soon. Currently 2.7.0-rc.3 is available and can be tested by the community. This release involves an upgrade of Sierra to v1.6.0, which means that contracts written in v2.7.0 can only be deployed in Starknet 0.13.2 and above. The test network upgrade is scheduled for August 5th and the main network upgrade is scheduled for August 26th.