T3fun announced that the Tokyo update will be added at the 22.this month.
Source: http://news.mmosite.com/content/2011-09-17/a_brief_analysis_of_the_present_and_future_of_rmt_in_online_games_1.shtml
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New Storyline
Hellgate Tokyo continues the story of the London Resurrection. Heroes will be able to continue mankind's fight for survival in the new expansion. Heroes start in Tokyo Base, and continue on to different locations as they progress through the story. Tokyo is composed of 24 new levels, with new monsters and boss monsters.
New Modes
Hellgate Tokyo introduces two new modes, Cow Room and Base Defense. In Cow Room, heroes will test their strength by facing hordes and hordes of zombies. These zombies can puff out flames, and some of their rooms may contain boss monsters that drop new recipes and shield set items. Also, sandstorms hinder heroes' seeing ability, adding extra challenge to the mode.
In Base Defense, heroes defend supply bases against a horde of demons. In order to overcome the challenge, heroes are required to work with other heroes to ensure the safety of the bases. If the heroes manage to defend the bases, they will receive rewards ranging from palladium to rare set items or legendary items, depending on how well they manage to defend the bases.
Re-opening of Hell Mode
Ask, and thou shall receive. Heroes wanting more challenge from Hellgate Tokyo will now be able to play in Hell Mode, with the chance of better loot and experience from upgraded mobs and bosses.
Hellgate Global crosses new borders with its latest expansion, Hellgate Tokyo. New maps, items, achievements, and bosses will be introduced with the expansion. Heroes around the world now unite to survive and win against the threat of annihilation from the destruction wrought by demons from hell. Hellgate Tokyo brings with it new challenges that heroes will be dying for!