After doing some internet research, I've developed my own analysis on the possibilities of U2 360 visiting Asia.
Japan: If it's during the summer of 2011, finding an appropriate stadium shouldn't be a problem. Japan has tons of big stadiums- including Nissan Stadium in Yokohama and Ajinomoto Stadium in Tokyo. Both stadiums have hosted concerts. Otherwise, I don't think the Claw would fit inside the Tokyo Dome or the Osaka Dome.
File:Tokyo Dome 2007-2.jpg - Wikipedia, the free encyclopedia
http://www.japanesebaseballstadiums.com/stadiums/images/OsakaInside.JPG
Mainland China: I don't get the whole argument about U2 not being able to play in China due to 'political reasons'. The Stones and Guns N' Roses have performed in China. Anyway, if U2 360 China were to happen, the Bird's Nest in Beijing and Shanghai Stadium in Shanghai would be on the radar screen.
South Korea: Seoul hasn't hosted stadium-sized concerts by Western artists in a LONG time. The only large-scale concerts in South Korea these days are put on by Asian pop singers. These concerts would usually take place at Seoul's Olympic Stadium, the World Cup Stadium, or Jamsil Baseball Stadium.
Hong Kong: HK is a growing market for Western artists. As U2FanPeter mentioned, HK has only one stadium. But hasn't been used yet for a huge concert by a Western artist. Contrary to what is believed, current Asian pop singers would do concerts at that stadium- albeit infrequently.
Cheer Chen’s full house in Hong Kong | Stareastasia
An outdoor U2 gig wouldn't go over well with HK Island residents, who often complain about noise coming from that stadium.
I should mention that a vacant lot now exists where the now-demolished Kai Tak Airport (north from HK Island) used to sit. Maybe U2 could build their own stadium and do a show there (a la Montreal).
Singapore: Well, Singapore is out. As coolian mentioned, its National Stadium is now demolished. The new National Stadium won't be ready until 2014.
Singapore Sports Hub - Wikipedia, the free encyclopedia
Unless U2 and Willie are willing to let the Claw float.
Kuala Lumpur: Well, U2 have already gone to Turkey, another mostly Islamic country. Of course, the Istanbul show didn't have a high turnout. Why produce the same results?
Indonesia: Ditto. Even though Iron Maiden will be touring there.
Taiwan: No stadium big enough on this tiny island.
Philippines: Ditto. Unless U2 is willing to build their own stadium again at Manila's Fort Bonifacio, which has been used as an open-air concert venue.
India: I don't see U2 traveling all the way out to the middle of the continent of Asia to do one show. Besides, most stadiums in India are circular cricket stadiums that would be of the wrong configuration for the Claw.
It's been said on Interference that the possibilities of U2 going to Asia (outside of Japan) depends on two things: (1) finding suitable venues and (2) whether or not the native populations would be interested. I'm sure the band and LN would want to be quite cautious so as to prevent another major Moscow-like non-sellout.
Just my thoughts.