(GMM) Sauber and Toro Rosso have become the latest teams to reveal details of their 2014 plans.
Swiss team Sauber said the C33 will be revealed online on January 26, which is two days before the start of winter testing at Jerez.
And Toro Rosso's 2014 car, the STR9, will be rolled onto the pitlane for the media on the evening before the Jerez test kicks off with Jean-Eric Vergne at the wheel.
Meanwhile, although McLaren's launch plans are already known, there are reports the new MP4-29 is still yet to pass all of its mandatory FIA crash tests.
The tests must be completed before the team's last Mercedes-powered car can debut at Jerez.
But a McLaren spokesman told Germany's motorsport-total.com that it is "normal" that teams push the envelope at this time of year "in order to achieve the best possible performance".