Hentschel plays Ash, a street dancer who is embarrassed by the Invincible troupe and sets out to get even in a rematch. Sampson reprises his role as Eddie, taking on an expanded part from the 2010 predecessor.
The globe-trotting drama takes place in London, Rome, Ibiza, Berlin, Amsterdam and Paris.
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Max Giwa and Dania Pasquini return to direct the sequel, working from a script by Jane English. Producers James Richardson and Allan Niblo are also back on board.
StreetDance took in £12 million at the UK box office in 2010, outperforming the Jake Gyllenhaal-led Disney blockbuster Prince of Persia.
StreetDance 2 will open in cinemas this March.