While many of the Chinese business-people speak English, those in the internal labour market may not (at least not fluently). Eliminating the language barrier won't help too much though unless some of the walls against foreign ownership/participation in the Chinese market are dropped. Currently it's often still quite hard to interact without a middle-man.
Indonesian is apparently the biggest economy on SE-Asia, or at least according to wikipedia, so that may make sense as well. It's also fairly close to Australia.
Japanese. Well they're not the tech poster-child anymore but I wouldn't count them out yet.
Korean. Supplanting Japan in many of the tech areas, with companies such as LG, Samsung, etc.
Hindi seems to be the dominant language in India (again according to WP), so maybe it's a similar case to China where knowing the language may allow one to bypass the middle-man. I'd say in those cases that knowing the culture is probably just as important as the language, however.