According to Cricinfo there is a preliminary list which they have seen that has 70 players on it. The list is now being pruned and updated by IPL officials, who hope to ideally have around 50 players in the mix.
It looks as if the franchises need about 15 players between them. All rounders being the most popular.
Players likely for February 6 auction from Cricinfo
Australia: Brad Haddin, Michael Clarke, Nathan Hauritz, Stuart Clark, Brad Hogg, Beau Casson, Jason Krejza and Shaun Tait. (originally 15)
England: Kevin Pietersen, Andrew Flintoff, Paul Collingwood, Owais Shah, Stuart Broad, Samit Patel, Shaun Udal, Darren Gough, Ryan Sidebottom, Ravi Bopara, Monty Panesar, Robert Key, James Foster.
South Africa: Gulam Bodi, Charl Langeveldt, JP Duminy, Paul Harris. (5)
Pakistan: Asim Kamal, Yasir Hameed. (2)
New Zealand: Mark Gillespie, Tim Southee, Jesse Ryder, Jeetan Patel. (9)
Bangladesh: Shakib Al Hasan, Ashraful Haque, Mashrafe Mortaza. (7)
Sri Lanka: Thilan Thushara, Nuwan Kulasekara, Jehan Mubarak, Malinga Bandara, Upul Tharanga. (14)
West Indies: Darren Sammy, Andre Fletcher (5)