They join rugby star Mike Tindall, who's married to the Queen's granddaughter, Zara Tindall.
The first series - in which stars compete in winter sports - saw injuries.
Two finalists, Sir Steve Redgrave and comic Marcus Brigstocke, retired hurt.
Sally Bercow, married to MP John Bercow, has been on Celebrity Big Brother, as well as appearing in a Channel 5 series with Paddy Doherty.
Ola Jordan partnered TV wildlife expert Steve Backshall in the latest series of Strictly, but was voted off the show in November.
Also in the line-up are Jackass star Steve-O, ex-JLS star JB Gill, Sir Paul McCartney's ex-wife Heather Mills and choreographer and ex-Dancing On Ice judge Louie Spence.
Former I'm A Celebrity... Get Me Out Of Here! contestants Phil Tufnell, Ashley Roberts, Joey Essex and Stacey Solomon will all be on the show.
Completing the line-up are Paralympian Jon-Allan Butterworth, socialite Lady Victoria Hervey, heptathlete Louise Hazel and Made In Chelsea star Louise Thompson.
Steve-O and Lady Victoria Hervey both appeared on ITV reality show Love Island in 2006.
The 16 contestants have already begun training for events including bobsleigh, slalom and ski cross.
The fastest racers in a skeleton bobsleigh will directly qualifying for the final stages, while others will have to perform a live ski jump to progress.
Those who jump the shortest distances will be put on a subs' bench to replace any casualties.
Last year's winner, Joe McElderry, was drafted in after too many competitors were injured.
Socialite Henry Conway broke a bone in his hand and Melinda Messenger withdrew with concussion suffered on the bobsleigh track.
Past British Winter Olympic stars Eddie "The Eagle" Edwards, Graham Bell, Amy Williams and Jenny Jones will be among the experts on hand for the show, which will be shown on TV early next year.
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Roedd Mr Jones yn ymgyrchu i Brydain adael yr UE cyn y refferendwm y llynedd.
Wrth gael ei holi gan y BBC ddydd Gwener dywedodd cyn ysgrifennydd Cymru, Mr Jones mai Mrs May yw'r "arweinydd gorau sydd gan y Torïaid ar hyn o bryd".
Y Farwnes Anelay sydd wedi cymryd ei le fel Gweinidog Gwladol dros adael y UE wrth i'r Prif Weinidog Theresa May roi trefn ar ei chabinet newydd.

The 40-year-old, from the South Bank area of Teesside, was discovered on the A66 in the early hours "in a distressed state" with wounds to his groin after the attack.
The road, from Greystones Roundabout to Church Lane in Middlesbrough, was shut earlier while searches of the area were carried out. It has now reopened.
A 22-year-old man was arrested on suspicion of assault and later bailed.
Cleveland Police said the injured man had been placed in an induced coma in hospital.
The force said in a statement: "Police can confirm that the man found this morning on the A66 had wounds to his groin area.
"Officers are continuing to investigate and are appealing for anyone with information to contact them."
Sally Bercow, wife of the House of Commons Speaker, Strictly Come Dancing star Ola Jordan and Gogglebox regular Dom Parker are among the contestants on Channel 4's show The Jump.
[NEXT_CONCEPT]
Mae'r Aelod Seneddol dros Orllewin Clwyd, David Jones wedi colli ei le fel Gweinidog Gwladol dros adael yr Undeb Ewropeaidd (UE).
[NEXT_CONCEPT]
A man has been found by the side of a road with his penis cut off.