(from Gametrailers forum)
from a page on famitsu that was deleted
"METALGEARSODA日本2009年1月1日に発売される。それに加え、 METALGEARSODAはフリーDLCとしてエネルギードリンクの代用としてMGS4 " REGAIN "利用できるようになります"
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translate from google :
METALGEARSODA Japan in 2009 on January 1, to be released. In addition, METALGEARSODA as a free DLC as a substitute energy drink MGS4 "REGAIN" will be available
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NOT CONFIRMED YET BUT LOOKS LEGIT TO ME
the japanese thing is something posted on neogaf by a user called shagg_187 and i just used google translate to check what it means....