No. You will still need to export to .idml to save back to CS6, as far as I know. CC subscribers, I have been told, will also have access to CS6 as part of their subscription, so that they can work in CS6 to collaborate, if necessary.
Thanks for the quick reply, Peter.
If InDesign CS6 is indeed included - and I have read the same thing - it will do.
It is a bit of a mess that the file format change from version to version, especially now when the CC apps is just going to be called CC and is always updated to the latest version. Eventualy we might have to work with CC 1.0, CC 1,5 and CC 2.0 files unless Adobe have some kind of brilliant solution. Oh well....
InDesign is a database. It ALWAYS changes format when a new major version is released. This is nothing new.
The good news is that in InDesign CC if you save as IDML, you can save backwards as far as InDesign CS4.