Right now, the disc door remains locked while it's mounted. This is the same way it's been for many years on Solaris.
There is an RFE to add code to HAL's storage addon to detect eject button presses (on drives that support it), which would result in a DBus signal emitted, causing the acting volume manager (gnome-volume-manager or rmvolmgr) to initiate the equivalent of /usr/bin/eject. -Artem
