just checked my WW model (UK), it doesn't have chinese pinyin/handwriting either..
there's a chinese mandarin voice ime but i doubt that would work well...
just fyi..as for chinese IME in general, Sogou pinyin input is always my personal favourite and its PC version is the most popular IME in China..
there's a version for honeycomb already..
You can get it off the official website: http://shouji.sogou.com/download1.php
the link for AndroidPad is : http://18.104.22.168/download/androidpad_1.0_sweb.apk
great keyboard layout to fully take advantage of hc's big screen..and it's got Pinyin (2 different keyboard layouts), Bihua (stroke) and Handwriting!...it also updates the dictionary every so often to download the latest chinese vocabulary...it understands the chinese grammar very well thanks to the data collected from its massive user base in China.
attached some screenshots