The new ad, which like "gorilla" has been created by Fallon, is described as a "magical airport truck race" in which a small one-man vehicle plays the role of an underdog in a midnight race against an assortment of bigger and faster trucks, such as a baggage transporter and motorised stairs.
The ad is light-hearted and fun in line with its predecessor, but unlike "gorilla" it will not feature a Phil Collins track.
Instead, "airport trucks" will feature an unnamed soft rock track from the late 1970s or early 1980s, which is in the process of being chosen for the soundtrack. The ad was written by Juan Cabral, the Fallon creative director who also created "gorilla".
Tony Bilsborough, a spokesman for Cadbury, said: "We can confirm that we're nearly ready to air the sequel to 'gorilla'. Like 'gorilla' and Cadbury Dairy Milk itself, it's designed to put a smile on viewers' faces.
"All the trucks have 'pimped' themselves to show their unique character, ready for the race of their lives. Phil Collins fans will be disappointed to hear that we haven't plumped for another of his tracks but we can say it's another great retro anthem."
The "gorilla" ad, which featured a man in a gorilla suit playing drums to Phil Collins' 'In the Air Tonight', quickly became a cult hit last year.
Cadbury partly attributed a 5% sales lift during 2007 to its popularity, while Sky reported that 58,000 households watched an extended version of the ad through the red button during the space of a fortnight.
Fallon was awarded the Cadbury brief, which later led to the "gorilla" ad, in February of last year as exclusively revealed by Brand Republic.