re: Is the A&M schedule change a done deal?

It's a compromise.

Arkansas wanted to play A&M at Jerry World. A&M did not want to play in Dallas and wanted the Arkansas game as a home and home.

A&M and LSU wanted to play around Thanksgiving weekend but Arkansas wanted that date.

All three agreed to moving A&M/Ark to Jerry World, Arkansas agreed to play LSU earlier in the season and A&M/LSU will be played on or near Thanksgiving. ie national TV
Arkansas wanted Jerry World for Texas recruiting.

Everyone got something and lost something in the deal.

tsips rightly got screwed. They are stuck with Texas Tech or TCU on Thanksgiving and no one (including the tsips) cares.