I'm not sure about the final name: Generations or Galaxies, so let's say Gradius Advance
It will be out first in America & Europe cause the game IS develloped by the USA division of Konami, that 's all
(a bit like Iridion 3D, which has not reach the Japan yet)
Check the Konami of America news page
Yu Gi Oh! for Game Boy Color and Gradius Galaxies for Game Boy Advance are coming to stores this November!