John;
In mid June when I was in Tunica for a short visit I saw a sign next to Hwy 61 near Tunica town that was promoting the coming "Solid Gold" casino at Mhoon Landing, that was the location of the old Splash, the original Bally's and the President. Also the place for the proposed "Splash Back" venture. Also in the local casino newspaper(Jackpot)issue I picked up during the 10 casino road trip was a short mention that a company from Canada, Myriad Gold was applying for permits for a casino off Indian Mound Road, that apears to be the 540 AC complex you mention. Both were mentioned in an article in the local newpaper the Tunica Times on June 17 th. The article is on their web site.
Jim