Read that they thought the virus was orginally from that open air meat market but it could of orginated from somewhere else
The issue is that they were thinking it was the meat market since a lot of initial cases came from there. However, since human-to-human transmission may have continued for sometime they can't be 100% sure.
I know a good bit of genetics (not amateur Ancestry.com style, far more professional level especially regarding microbes and I have some lab experience...) and following some of the academic discussion online, there are almost 40 genomes sequenced for the 2019-nCoV (current technical name) and the extremely close similarity of the DNA sequences indicates:
1) It jumped from animal to human, likely from a bat coronavirus
2) It only jumped once---all strains are variants of a single original and there is no divergent strain co-circulating that would indicate multiple jumps. All transmission since patient zero has been human-to-human
3) It jumped recently, likely between late October and early December. They can actually infer this by matching the sequences, infection dates, and back-timing mutation rates
4) At least the first US infection was related to the strain going around in Shenzhen but I don't know about the subsequent ones. As the epidemic progresses we can use genome sequencing to track where each outbreak likely spread from
The amazing thing is, compared to SARS in 2003 when full genome sequencing was slow and super expensive, genome sequencing is now everywhere and ultra-cheap. Even I could sequence a coronavirus case for a few hundred bucks most likely. All this data will allow us to track and hopefully contain it much better now. CDC has already published tools so hospital labs can make their own diagnoses if they have the right equipment (i.e. PCR).