Ryan Taylor reported that the field's grass was usually sodded with Kentucky Bluegrass, which typically thrives in cooler weather and recuperates and regrows more quickly from wear. Bermuda grows in warmer weather and is more resilient to wear than Kentucky. There's a possibility the grass is re-sodded in the later weeks of the season with Kentucky Bluegrass since it holds better in colder weather.
The move to new turf isn't just a nice touch, it actually appears to be an upgrade from what the Bears were rolling out there prior to this installment.