US wireless companies knocking on Japan's door

What caught my eye this morning is an unusually high number of announcements about the US companies trying to enter Japan's mobile market. Is it just a coincidence or some seasonal peak of activity? Anyway, read them below as follows:

Start-Up Amp'd Mobile to Sell Entertainment Content in Japan
MVNO Amp'd Mobile said it has inked a deal with KDDI Corp. to sell U.S. film clips, music videos and other entertainment content in Japan. The pact reflects an effort by Amp'd to expand into markets where a greater percentage of mobile phone users subscribe to and use data services. Source: Wall Street Journal

NTT DoCoMo, Intel help companies customize phones
NTT DoCoMo said it has teamed with Intel to develop terminal specifications that provide an open domain for companies looking to customize handsets with special operating systems or applications. Source: Unstrung

Sierra Wireless Formally Enters Japanese Market
Sierra Wireless is making an official play for a piece of the 3G wireless market in Japan, thanks to a newly signed deal with Tomen Electronics Corporation. The deal makes Tomen the primary distributor of Sierra Wireless' 3G products in the country. Source: Wireless Week