Got my C860 for 2 weeks. My impression is that this beast is really a bigger PDA and a smaller laptop. Back to your questions:
1. Yes, most icons/menus may be converted to English.
2. Have not tried this yet but I remember the support is currently up to OS3 or something.
3. You may get a free soft keyboard installed with Changjei, Phonetic, Boshiamy (?) input methods. There is no handwritting recognition out there.
4. I have seen in one forum talking about someone dropping an 5600 from the top of the roof (the guy was doing some works for his house) without serious damage. And the unit is still working properly. The clamshell design of the Cxx0 serious actually protects the screens from direct hit like most of today\'s PDAs. In anyway if you treat it well I think the durability would not be an issue.