(Based on JBDS use case - see EAP6-1)
See also https://mojo.redhat.com/docs/DOC-934058 for notes

By incremental redeployment, we mean the situation when something is deployed, and after changes (in IDE e.g.), only that single file (.jsp, .xml, .class) would be re-deployed to the server, over management API - which is, you'd give it a stream and a path where it belongs in the deployment, and the operation would accept that file and put it to the right place in VFS, clear caches etc.

Use cases:
Big .war's, mainly on remote
Cloud deployments
Also, you loose sessions etc.

"JSP recompile on file update" - mgmt API operation - added in WildFly 8?

Not expected to work in domain mode.

Stuart said that session persistence is implemented in WFly 8, but not the incremental redeployment.