The clip, which will air on the Today show's Web site at 4 p.m. EST, is the first single from the group and their first release since splitting up in 2001.
"We are celebrating the past!" said Geri "Ginger Spice" Halliwell in June when the band announced their reunion tour, set to launch Dec. 7 in Los Angeles.
The upcoming tour, marking the Spice Girls' first performances in nine years, "will be a proper good farewell to our fans," said Melanie "Sporty" Chisholm.
Victoria "Posh Spice" Beckham added, "We are going to celebrate the past, do a small tour and that will probably be it. Our priority is our families." All of the Girls except Chisholm have become mothers since their '90s heyday, when they sold 55 million records worldwide.