The last two photos above are actually of the EAST (Bay) moat. I saw the orange tarp there earlier last week but on Friday it had been removed to show fresh concrete - see post above. If it was covered up again yesterday it is presumably to allow this concrete to cure without getting too exposed over the holiday. As noted above, this appears to be the 'base layer' of concrete as there were (are) pipes sticking up about 6 inches.
This will likely open up in the late spring to early summer. Judging by the exterior shots of the east moat there is still much work to do before it is safe for the public to be around. I can only hazard a guess but unless they are building a makeshift passage through the old bay concourse I doubt they are going to open any portion of it in the near future.
If they were smart they would finish the moat and leave the rest until it is all complete.