I believe that slicks will be ready for teams to test, so that's one thing on the programme list.
And maybe teams will have cars setup like the F2008K, a 2008 car that is KERS ready and/or simulates the package with ballast. And features some if not all of the 2009 aero features.
And some teams are going to be testing a number of new drivers, such as Toro Rosso and Honda.
Force India is going to have it's last test with Ferrari engines, as reported in the news section, and is not expected to test until testing resumes in early 2009, when the new chassis with the Mercedes engine is ready.
So there's plenty of work to be done for everyones, all excuses used for a lack of performance in 2008 have been thrown out the window. Hopefully teams like Honda can step it up and produce results next season, since that's all they have been talking about since who knows when. They have a very serious winter testing programme, according to them they have the largest available supply of tires, of which they saved for throughout the season. Although as I see it it's rather pointless, because next season they will have to use slicks.