The Centre for Health Protection has created a useful page on Severe Respiratory Disease associated with a Novel Infectious Agent. Click through and you'll find a link to the latest situation, a PDF dated January 9. It lists 48 Wuhan-linked respiratory cases, 10 of them reported today.
But bear in mind that most of them have tested positive for known viruses like rhinovirus and adenovirus. Until Hong Kong gets the information on the new coronavirus, it's hard to tell how many (if any) of the travellers actually have the new virus.
