Will GBA titles be release for 3DS Ambassadors on October 27?
Only time will tell.

I've only played a bit of Super Mario Bros and The Legend of Zelda on the 3DS, and it just doesn't feel right and completely lacks the nostalgia and magic factor when playing these titles 'like they were ment to' be played on the big screen. The button layout makes them a bit trickier to play as well.

I would of much prefered eShop Cash rather than the free games. But the GBA games will be great no doubt.