I can't find a list of changes that affect the value of players such as injuries to valuable OT's and linemen, trades of such players, and personnel changes.
Here are some I can think of, lets tray and make an extensive list here:
Brian Bulaga OT Green Bay (Season ending surgery) = Small downgrade to Rodgers
Percy Harvin WR Seattle (Likely Season Ending) = Downgrade to Wilson
Jeremy Maclin WR Philadelphia (Season Ending)= Downgrade to Vick, possible upgrade to Jackson and McCoy
Dennis Pitta TE Baltimore (Season Ending) = Downgrade to Flacco, Shiancoe upgrade
Carson Palmer QB Arizona=Major upgrade to Larry Fitzgerald
Wes Welker WR Denver=Upgrade to Manning, possible downgrade to Decker and Thomas?
Danny Amendola= Slight downgrade to Brady
Chip Kelly: Upgrade to Vick and Phily players in general
Doug Marrone: Upgrade to Spiller and Buffalo offense in general
Bruce Arians: Upgrade to Rashard Mendenhall and Arizona O in general
Marc Trestman: Upgrade to Matt Forte