According to DCfever’s facebook page (thanks Frank) Canon will hold an announcement event in Hong Kong on January 9th, 2014, two days after Nikon is also set to make an announcement. The text says (slightly corrected by myself):
Following the earlier news conference in Hong Kong [we] received an invitation [from] Nikon, [and] Canon also immediately [followed with an invitation] thereafter, on January 9 [a] press conference [will be] held [by Canon ...]
We can only speculate what will be announced on 1/9. As you can see in the comments for the Facebook post, speculations are going wild, considering anything from the EOS 7D Mark II to the EOS-1D X Mark II, not to forget a set of lenses.
Actually, no one knows what is coming. After the rumors stating that there will be no EOS 7D Mark II, but, instead, a new APS-C flagship with another name, I do not really expect this DSLR to be announced next week. Same for the lenses, which should be announced later. The latest rumor was about a high end, high resolution DSLR with a hybrid viewfinder, and this one too is set (if the rumor is reliable) to be announced later this year.
The interesting fact is that Nikon will held an announcement two days before Canon. That, indeed, could be a sign of something important coming. Stay tuned.