Further update, Ferrari is to launch its new challenger before the 1st pre-season test, which is taking place at Jerez, Spain between 5 to 8th Feb.
Sauber has also confirmed they will unveil its 2013 car on the 2nd of Feb
Latest informations on each team's launch date:
Team Date
McLaren January 31
Ferrari February 1
Force India February 1
Sauber February 2
Red Bull February 3
Mercedes February 4
Toro Rosso February 4
Williams February 19
Another launch date has been set by Lotus, its car will be launch well before Mclaren's 31 Jan.
It will be launching the new F1 car via Youtube on the 28 Jan at 7:15pm [UK time]
Latest informations on each team's launch date:
Team Date
Lotus January 28 [via Youtube]
McLaren January 31
Ferrari February 1
Force India February 1
Sauber February 2
Red Bull February 3
Mercedes February 4
Toro Rosso February 4
Williams February 19