From what I understand, the Columbus location (Penn National) is under construction now. The original location ran into some local opposition roadblocks, which cost them a fair amount of time.
The Cincy (Caesars Ent.?) location is hitting some problems as well, so their timeline is pushed back even further. I don't know about the logistics of the other two joints.
Bascially, despite the bill being passed at the state level, it's all come down to local issues: community groups, redevelopment issues, site suitability, etc.