Option for workmail users to share free-busy information via iCal

We are researching hosted email solutions. We have a mandatory requirement to allow email users to share free-busy information via iCal.

We envision this as an organization-wide or group-wide configuration setting to allow users to share their calendar and/or free-busy information via URL A should-have feature is restricting sharing to only free-busy information or sharing full event details. A nice-to-have (not needed for our requirement) would be full editing via CALDAV. Once configured at the org-wide or group-wide level, an individual could configure a unique iCal URL that others can use to view calendar data.

Is this a roadmap item or will it simply never be supported (for security reasons). If the answer is "this is a roadmap item", can someone from the AWS team comment on whether it is on a list and not yet prioritized OR on a list and prioritized/scheduled?