Seems like people in Hollywood aren't the only ones who get special treatment when it comes to this kind of stuff, considering that the police allowed him to come in today rather than arrest him on the day of the allegation because he was attending the London premiere of his box office blockbuster THE DARK KNIGHT. One officer was stated as saying, "It was a very difficult situation but it would have been wrong to have wrecked the premiere over a complaint which we don’t yet know is founded in truth. But Mr Bale will be contacted at the earliest opportunity and be asked to provide an account of anything that happened.
Hopefully more details will come up soon after Christian is interrogated today and we can find out why he's got a family that would turn on him. I know the dude can look intimidating and all, but he seriously doesn't strike me as the kind of guy who would assault his mother and/or sister.
UPDATE: Bale was questioned for 4 hours before being released. The issue at hand was a verbal assault charge leveled from his mother. In the UK, a "Class 4 Verbal Assault" is described as being one with an "intent to cause alarm." Bale disputed the charge against him and is complying with police on the matter.