I'm interested in submitting forms to Alfresco in the cloud, but have been unable to find any information on this sort of functionality. I know Alfresco Community Edition has support for the Forms Development Kit (http://wiki.alfresco.com/wiki/Forms_Development_Kit). Is this possible at the moment, or if not, is it planned to be added in the future?
The Alfresco FDK as it is currently will only work with on-premise Alfresco. But you can sign up as a Registered Developer at http://developer.alfresco.com. Doing so will give you access to API keys you can use to write your own application that persists data into Alfresco Cloud.
The Alfresco Cloud API is made up of CMIS AtomPub for performing CRUD functions with documents and folders plus Alfresco RESTful URLs that cover functionality that CMIS does not cover.
This means you can use whatever language you prefer to display forms running on your servers (or in the cloud or on a PaaS or whatever works for you) that work with the Alfresco Cloud user's data.