He plans on expounding. In fact he gave the Cain campaign some good advice, that being to just sit back and wait because this woman has a background that will make her very hard to believe and the press will have it shortly.
Unfortunately, I see Cain has announced a presser for tomorrow. Maybe he will simply deny the charges again and then say you guys go find out what you can about the story (i.e., Ms. Bialek).