Maybe I am missing something, but since the press release is from 2008, the priority date must be before that (they already have the application number...). It means that 18 months must have expired, so the application should have been published, unless it's withdrawn. I presume that, given the application number, one should at least be able to inquire whether the application is active or not at the USPTO, whether or not the application itself is available in the online database. Give USPTO a call?
Another thing, can you tell if it's a design or a utility application? If it's a design application you are shooting yourself in the foot a little bit by citing it as relevant to your utility app (I assume yours is a utility app). But you do not have a choice but to report it. If it's a utility app though, you even have a little argument for yourself, saying that the press release is not an enabling description and therefore contains insufficient info to properly evaluate the differences between what's named in the release and your app. The fact that the application related to the press release has been kept secret works in your favor here, since there is no point to have secrecy if the press release has disclosed the invention in an enabling manner.
Make sure you print out the press release and keep it for your records.
EDIT: keep in mind, Chinese company's Chinese patent would make your application useless just as easily as an American patent. So you are more or less stuck having to figure out more about this patent application. I am wondering if patent assignment database would have info even for unpublished patents applications? It's not a given that the original application was filed by that company, they could have gotten the rights from somebody. I am saying this because simple search under the company's name doesn't guarantee the right answer.