Give me a second, long name take a screen of it and upload. Really wanting anyone with dev to give take on the name and the file extension to see what they thought. Curious if this in anyway infers they have completely moved to ly?
I'm not sure what you're getting at. CIG say they're using Lumberyard. That will be the modified CryEngine editor now named Lumberyard. The .cry file extension will be inherited from the original Cryengine code (as are directories named CryEngine etc).
The interesting point which Derek made is whether they have moved the code base to Lumberyard, or simply ported their custom code to the new Editor. Since the first would require them to start with a fresh build of the Lumberyard code, then manually go through every file, copying across any changes that they've made, and only those changes. More likely, to be recognised as Lumberyard simply requires some extra code linking to the Amazon Web Services, so rather than untangle all their code from original CryEngine, they've just added these new AWS features. However, having not attempted to port a modified CryEngine to Lumberyard then this is just speculation on my part.