- ICS has new font "Roboto" as default. Also, Galaxy Nexus has no Droid Sans. Our prefs.js defines only "Droid Sans" for san-serif, so Fennec doesn't use Roboto. - ICS has new font MotoyaLMaru and MotoyaLCedar for Japanese. We should add it for font.*.ja.
It looks like this didn't make it into the m-c -> aurora merge for mozilla12, so it's currently headed for mozilla13. In view of bug 721719, which is seriously aggravated by the lack of Droid Sans on ICS devices (and so we fall back to an unexpected and broken font), I think we should consider taking this for 12.
Argh - sorry for the bugspam - please ignore comment 4, this _did_ make it into mozilla12.