This news piece from a while has more info:
The 4 finalists are these:
1. Enoch (front runner)
2. Century Casinos (casino on Fort Rd near Belvedere LRT station)
3. Alberta Downs (want to move it to Lacombe)
4. Siksika Resource Development (FN reserve east of Calgary)
Enoch already has the land next to the River Cree casino, sounds like they are shovel-ready.
There's plenty of industrial wasteland near Century Casino to build a track, assuming that's their plan. Having the LRT station there is an added bonus.
If the RFP stipulates that it has to be in the Edmonton area then the Lacombe bid is a non-starter.
Not sure where the Siksika would build theirs.