Well, assuming the death of Henry I instead of William Adelin—William II is going to have to find another heiress for his cousin, Stephen de Blois.
William Clito's status IOTL was massively increased by the death of William Adelin, because it made him the most senior male heir of the House of Normandy. So, the White Ship surviving the storm does change things, but so long as William Adelin has no children, Clito is a potential successor (ignoring the Empress Matilda—c. 1120 she is still in Germany and married to the Holy Roman Emperor). Nevertheless, Clito makes a very useful pawn for the Capetians to destabilize England and Normandy. It'd also be in France's interests for William Clito to reclaim Normandy in order to detach it from England.
Is Charles the Good still murdered, as IOTL? If so, Louis VI may make Clito the give of Flanders, as happened in history. Along with the possessions of Matilda in Boulogne, it makes a decent domain from which to make a potential claim on Normandy. If things go awry for William Adelin, it would be interesting if Clito reclaimed his birthright in Normandy and somehow ended up on the English throne if Adelin died without heirs—the combined lands of England, Normandy, and Flanders would be very interesting... instead of the Angevin "Empire" of OTL, which sprung out of Anjou and Normandy, we could possibly have a Norman "Empire" based around Normandy and Flanders, perhaps with an ATL heiress to bring Brabant or Holland into their orbit?