After the short off season, there is lots new on tour, especially what's in players bags. So here is the significant change list.
Players changing brands:
Rory McIlroy - Titleist & Oakley to Nike
Nick Watney - Titleist & Hugo Boss to Nike
Kyle Stanley - Titleist to Nike
Seung-Yul Noh - Titleist to Nike
David Duval - Back to Nike (making a comeback this year)
Lucas Glover - Nike to Taylormade
Nicolas Colsaerts - Titleist to Callaway (mixed bag)
Ryan Moore - Adams to Taylormade
Bubba Watson - Travis Matthews to Oakley
Zach Johnson - whatever he was wearing to Oakley
Webb Simpson - Polo to Izod
Keegan Bradley - Oakley to Nike (footwear only)
As for simple known in the bag changes:
Webb Simpson: Switched from Titleist 712 MBs to Titleist 712 AP2s as well as the new 913 driver and fairway metals
Bubba Watson: No more G20, new Pink G25 is in the bag as well as a new Ping Scottsdale prototype putter.
Rickie Fowler: Almost all new clubs, the new AMP Cell line from driver to prototype blade irons. GOLO is the putter to start the season.
Steve Stricker: Switched to new 913D
Luke Donald: Switched from R11S to RBZ driver
Dustin Johnson: New R1 and RBZ Stage 2 in play at TOC this week
Watney & Stanley: Hitting the VRS Covert line to start the season
Will update once McIlroy's Nike bag is released before his start in Abu Dhabi on the Euro tour later this month.