There is no evidence that this is biowarfare. The H5N1 virus was tinkered with in the lab, but that was also not a biowarfare thing, more likely it was aimed at profits. nCoV appears to have had its origin in the UAE and Qatar. There is some thought that nCoV may have originated in camels, and made the jump to humans from them. It made its appearance shortly after the Hajj in 2012.
There are several reasons to up the concern level on nCoV right now. One is the possible breakdown of government in Egypt, not to mention mass gatherings of hundreds of thousands of people. Syria is a mess with refugees all over. There is reason to believe it is more widespread in Saudi than they are admitting, and it isn't just in Saudi. We just can't get reliable statistics on this disease. We do get news releases of odd incidents such as mass closings of schools etc. in several Middle Eastern countries. It's likely at this point that many have travelled to Mecca already, given Ramadan starts in a week.
They are testing a first possible case in Hong Kong. We don't have the results yet. A man who went to Tunisia and Dubai, and went camel riding. Apparently he is in the hospital in Hong Kong and they are awaiting tests. Testing for nCoV is difficult and often nasal swabbing isn't sufficient. It requires bronchoalveolar lavage, and that is quiet an invasive procedure.
I'm not sure how well they can contain this disease any more. But with the social unrest and then the Hajj, it seems to me, it could be a lot more difficult in a few months. On the good side, it seems to take more than casual contact of a few minutes to spread it (so far). I doubt we will get any more transparency from these highly controlled secretive countries. Watching this virus is mostly watching for when it escapes.