The first SEGA console 3DS theme to make the big move from Japan to Western eShops is a Game Gear one. You can check out a short video of it in action by clicking here.
SEGA had been previously teasing the launch of the console 3DS themes with a short soundbyte that also confirms the existence of the Dreamcast theme. You can check that out by clicking here.
More news on release dates and what other console themes SEGA decide to make the jump to the West as we get it.
[Source: SEGA Twitter]