As far as the longer term's concerned...
-An off-ramp/on-ramp for the Freeway/Menangle Road, both sides and for North & South bound travellers.
-On-course stabling.
-An all purpose events facility so that, amongst other things, the Sydney Yearling Sales can eventually be held at Menangle.
I am pretty sure most if not all of the above is already in the planning. I can't think of anything else at the moment.
A Web-Cam feed direct from Trackside for interviews & such, done as an expansion of the Trots TV concept, would also be pretty bloody good.