Esta basada en CM9 y veo pocos cambios entre ambas pero bueno,habra que esperar a ver como evoluciona.Aqui los cambios...
Changes between Ganbarou GT ROM and CM9 ROM:
Bootanimation
Wallpaper
Extended apn-conf.xml to include Softbank Japan APNs
Changed gps.conf to have more AGPS servers
Full working Polaris Office from stock ROM
Full working Samsung Apps from stock ROM
Added Titanium Backup and ROM Toolbox