The announcement was made on the 20th anniversary of the iconic video for "Wannabe". The song became the biggest selling debut single by a female group.
"GEM", a trio of Mel B, 41, Geri Halliwell, 42, and Emma Bunton, 40, all appeared in the video to thank their fans, reported E! online.
"We've been thinking, we have the best fans in the whole entire world," Mel B, better known as "Scary Spice" said in the video.
"You've stood by us for 20 years, and we want to say a big thank you," Halliwell, "Ginger Spice" continued.
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"And we want to celebrate and have a party, And when we do, you're all invited!" Mel B concluded.
They ended the video with a message across the screen suggesting further news, which they plan on announcing later.
"Happy 20th birthday to all our fans, This is a celebration for you! We hope to tell you soon, what you want, what you really really want #WANNABE," the text at the end of the video read.
Victoria Beckham and Mel C were noticeably missing in the video, though the latter took to twitter to reminisce the hit single, "Happy 20th birthday Wannabe - you haven't aged a bit!"