I may be jumping the gun a bit here this year, but if you've ever been in the market for Chinese Christmas songs, you've probably run across Sinosplice's collection that John put together a few years back here. I came across his mix today as a compromise solution when my wife wanted to listen to Christmas music and my daughter wanted to listen to Chinese music.
My daughter has become particularly fond of track 3, a Chinese rendition of Santa Claus is Coming to Town, and has been singing it all day (and listening to it all day, in the way that only kids can seem to listen to the same track over and over again). In any case, it's providing a good dose of Chinese exposure that she wouldn't otherwise be getting.
I did a precursory look around the internet for more Chinese Christmas songs, but wasn't able to turn up anything with ease, and I wasn't able to easily track down the lyrics either, so if anyone can turn up either more Chinese Christmas songs or the lyrics to the songs that John has up there, I'd love to hear from you.