This is a sort of 'how long is a piece of string?' question in that really you can't assume either option is more likely at this point in time.
They may need to discuss it, they may need more time, they may not have even had the chance to really discuss or formalise it because they are busy and are meeting later...this would be one thing in a long line of things that they have to do and there is not enough evidence to assume that the reason they haven't got back to you a day later is due to a particular reason.
Good luck and hold tight...:)