Should be no problem unless it's blocked on their end (I don't believe it is, though).

Same for me. Impulse connects just fine in China.

But I would suggest paying for the game before you left, as sometimes buying things online when in another country doesn't always work out the way you'd hope it would.

Where in China are you going?

Download won't be a problem. Just be aware that internet speed in China is generally capped at 4mbit. Still enough to download in due time, except for hotels which will be fairly slow to download from.

If you're into facebook, twitter and google docs, you better have a proxy.