Facebook, apparently, is planning something pretty big.

Per reports, Facebook is set to hold a certain press event in a few days, Jan. 15 to be precise, as it has been stated that the company is on the verge of revealing something entirely new, or, per the company, to "see what we're building."

Currently, the social networking giant is sending out press e-mails inviting members of the press to its headquarters in Menlo Park, CA for the Jan. 15 event at 10AM PT for the first look at their recent mystery project. The invitations have been circulated amidst the on-going CES 2013 event, and have suddenly attracted attention due to the curiosity element leaving little to guess, especially with the mysterious tagline.

New reports state that Facebook could yet again discuss, or even announce, about the possibility of a brand new Facebook phone, something very similar to the previous HTC ChaCha and Salsa. After the previous rumors of such a device, the Facebook phone project surfaced once again in last November and brought the possibility of a HTC-made Opera UL device that could be a potential future Facebook phone.

Although that project was eventually delayed, the new Jan. 15 Facebook press event could still hold the key to such a device, and could also mean that the company has completed the development of such a device. There is also a possibility that the new revelation could relate to something entirely different, or some new features to both the Web and the mobile version, or even a possible acquisition.

"Recent rumors have suggested that a Facebook handset is still in existence, but it is not yet clear if that is even remotely the subject matter. The company could just be announcing new web features, like ramped up search, or getting Zuckerberg to bore journalists with more details and graphs of Facebook's social graph," a Pocket-lint report states.

Moreover, it was also reported back in May last year that the social networking giant had hired more than half a dozen Apple engineers who worked on the iPhone and iPad to build a Facebook smartphone.

Nonetheless, the last time Facebook hosted such an event was at its Palo Alto headquarters in California about a year and a half ago. At that event, Facebook CEO Mark Zuckerberg had announced the company's partnership with Skype.