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Japanese manufacture OJI announced they will release a portable balanced amp.
OJI is known by their audio cable that mainly used by pro music engineers, and custom amps.

Here is their Japanese page.
http://www.ojispecial.jp/catalog/cbhpa1.html

The amp employs two mini plug as output jack and run off three AAA batteries.

Here is their blog (Japanese)
http://oji.blog.so-net.ne.jp/2009-03-22
You will find one more unusual amp at the bottom of the page
They wrote it also run off battery with three AA. This one employs XLR in/out.