I had heard that December 16 would see the release of the GBA games that would be part of the 3DS Ambassador program, but didn't report it because I didn't know how official it was. But now I can tell you that yes, if you were an early adopter of the 3D handheld and are a registered 3DS Ambassador, you can go right on into the eShop and download your GBA titles.
It's a little annoying how you have to download these Ambassador titles. It's the same as the NES batch. You have to go into Settings/Other and then tap "Your Downloads." At which point, you scroll down until you find the games you want and then tap "Redownload." The GBA games you can get for free are:
F-Zero Maximum Velocity
Mario Kart: Super Circuit
Wario Land 4
Yoshi's Island: Super Mario Advance 3
WarioWare, Inc.: Mega Microgame$
Kirby & The Amazing Mirror
Mario vs Donkey Kong
Fire Emblem: The Sacred Stones
The Legend of Zelda: The Minish Cap
I know a lot of people are excited about Minish Cap, but I've already played that. Although come to think of it, I've also played Metroid Fusion, too. But don't think I won't totally download and play WarioWare again. Those games are hilariously bizarre. I can safely say I will not be downloading Fire Emblem, though. I played one of the games in that series and almost tore all my hair out. So I guess I'll try Mario Kart and maybe Kirby... and Mario vs. Donkey Kong... although I feel like I've played that, too. Wow, the memory really is the first thing to go when you get old!