Nearly a year later, the series has resurfaced, unofficially. In the latest list of ESRB-rated games, a few new Game Boy Advance games have been revealed: Boundish, Chromatron, Dotstream, Orbiter, Rotohex, and Sound Voyager, all listed under the moniker Digilux Series, and each receiving an "E" rating. Their separate listings indicate that the games will be released individually, and indicate that the series and individual game names have been changed and trademarked since their E3 2005 debut.
Again, no other details have been revealed about these games, but considering that they've just been rated by the ESRB, and considering that it's been extraordinarily quiet on the GBA front in the US, expect an official announcement from Nintendo of America.
Hit this link to see the original E3 2005 trailer.