We do not know when A7 will be released, except that it will be probably this year. A7 will contain the new renderer that is currently in beta test, and lite-C. For all other features it depends on their release date whether they make it still in A6, or in A7.

Lite-C as a separate product will in short be freely available for a public beta test. The current A6 keys are also valid for A7. So when you order A6 or an A6 edition upgrade, you automatically get free upgrade to A7 when it's released.