Richard and Nicky have both made reference to dancing in cuban heels, although as they haven't outright said what they're dancing I'm going to hold off for the moment.
So just so we can keep track:
Colin & Kristina - ?
Dani & Vincent - ?
Denise & James - ?
Fern & Artem - ?
Jerry & Anton - ?
Johnny & Aliona - ?
Kimberley & Pasha - ?
Lisa & Robin - ?
Louis & Flavia - ?
Michael & Natalie - Waltz (definite, via Twitter)
Nicky & Karen - Cha-Cha-Cha (very likely, via Twitter)
Richard & Erin - Cha-Cha-Cha (very likely, via Twitter)
Sid & Ola - ?
Victoria & Brendan - ?
Unless the formula has been changed it should be six Waltzes and eight Cha-Cha-Chas.