You can continue to use AnyConnect Roaming Security module (Umbrella connection) even though you use an FMC-managed (or FDM-managed) FTD device as your VPN headend. I use it that way every day.
You just cannot deploy the module from FTD. You need to deploy it via separate means (manual install, Windows SCCM etc.)
As far as Cisco's roadmap they don't generally publish those publicly. They are aware of the limitation though and we have been pressing them to remedy the situation.