If you live in Japan (or have skills in playing their games on your own console), then you should be excited! Sonic Advance is heading to the Japanese Nintendo eShop next week! The game will officially launch February 18th for a reasonable price of ¥702 ($5.90/£3.90).
There has been no word yet on an international release date or plans for the other two Sonic Advance games to be released. Keeping checking back in to SEGA Nerds for new info!