Isn't this basically the entire east valley? Sounds more like a case of Shannon throwing - you know what against the wall - and see what sticks.
There are four very distinct sites:
SCOTTSDALE: Salt River-Maricopa Pima Indian reservation. Location of Talking Stick Resort and Salt River Fields, the Diamondbacks' new spring training facility, as well as an entertainment/dining complex.
Google Maps
PHOENIX: In or around the current location of Talking Stick Resort Arena (formerly US Airways Arena, formerly America West Arena, etc.). The idea here is that TSRA will be repurposed into a consumer complex or mall and that the new barn would be built somewhere adjacent. Unfortunately, it also means that the Coyotes would co-tenant with the Phoenix Suns, which is worst-case scenario for team revenues.
Google Maps
TEMPE: Located in the general vicinity of Karsten Golf Course by ASU. Built in conjunction with ASU on University-owned grounds.
Google Maps
MESA: Location to be adjacent to or in the vicinity of Sloan Park, the Chicago Cubs' spring training facility. Nominally in Mesa, but only two miles east of the Tempe location at the junction of the 101 and 202 Loop freeways.
Google Maps
In summary, the sites encompass a 48 square mile triangle reaching from Phoenix on the west side to Sloan Park on the east and up to the reservation in the northeast.
The Phoenix location is most central to the metro area but the least accessible. The other three locations are all off of major freeways. The reservation land is closest to the most affluent portion of the Valley (Scottsdale, Fountain Hills, etc.). Mesa's location is right at the junction of about 70% of the metro area's freeway traffic.