We're close to completing a project that allows 2-way communication between InDesign and our CMS. We can import stories and export them back. This is a 1st-gen product so I expect it to change and it's a model that fits our workflow and technologies specifically. Instead of buying an expensive front-end system we wanted to take advantage of our homebuilt CMS to handle both print and digital workflows.
I'd love to share what we've done and also gauge whether folks are interested in doing this for their shops.