I was asking myself that question too. Sandbox/forge editor would be fantastic and it would also increase the re-playability factor.
I don't know about a console editor but a PC editor that could export to a file share on both PC and console would be awesome. But then again, all of this requires more work and programming that might affect the core of the game that we wanted originally.
Besides I think the development time is up, 3 more weeks till release so only time will tell. But IMO, I don't think they will have one on release. You never know if they might develop one later as DLC.