The exchanges halt stocks that are going to be releasing material news so that investors have an equal opportunity to react to the news.
Once the news has been released then the halt code changes to a T.2. This means that the news has been released but that the stock is still halted.
After that, the halt code will change to a T.3. This means that the news has been fully disseminated and there has been a time given when the security will be released for trading. There are actually two times given in a T.3 halt - the time when quotes can be entered, and the time when the security will be released for trading.
I think my reply didn't post because I included a link, so re-typing here
What you are describing is a T1 halt. That is not the situation with YONG. They are in a T12 halt which means the Nasdaq is waiting for YONG to provide information that they have requested. This is not related to the imminent releasing of material news.
I won't try to add the link again but just google "nasdaq halts" and you'll see YONG listed with the T12 on the nasdaq site