While this doesn't mean anything will happen, it certainly isn't bad news.
http://kotaku.com/5135925/developer-would-like-ds-mother-3-for-fans-abroad
I'm keeping my fingers crossed.Kotaku said:GameBoy Advance Mother 3 sadly never got a Western release. That doesn't mean it couldn't possibly get a DS release.
Nintendo funded studio Brownie Brown had a hand in developing Mother 3. Brownie Brown President Shinichi Kameoka said a DS port is possible — though, this is not an official announcement in any regards.
"If we were asked to make one [a DS version of Mother 3]," Kameoka said, "then we would definitely like for fans abroad to play the game."
http://kotaku.com/5135925/developer-would-like-ds-mother-3-for-fans-abroad