Ofcom received complaints after the promo was aired on the Saturday morning broadcast of WWE Superstars on 11/10/12. The series airs at 9 AM on Sky One.
The majority of the complaints were whether the vignette was suitable for a series where half the audience is under the age of 16. The specific issue were close-ups of punches and kicks.
Sky responded, stating they would edit out these types of scenes in future. They also specifically noted they already edit out headbutts and mild language on the WWE programming.
Of course, this is all a moot point, since WWE hasn't run those promos for months.
The full complaint and verdict is up on page 23 at this link.