When (if ever) might FrameMaker make it into part of Creative Cloud? It would be soooo nice to use it as part of that subscription. And add-on subscription maybe?
I am afraid that is a question for Adobe themselves. No one here will be able to answer that. All I can offer is that you make your view known to them by submitting a feature request. The more that do, the greater chance there is that it will eventually happen.
FM is already part of the TechComm Suite "Cloud" product (i.e. subscription basis product) and probably will never be part of the "Creative" cloud.
For more details, follow the links here: http://www.adobe.com/ca/products/technicalcommunicationsuite/upgrade.d isplayTab3.html