Although the game hardly lit up the Japanese sales charts--retailers have moved just over 160,000 copies since it hit the streets on Sept. 17, 2009--it apparently sold well enough to warrant another DS-bound SaGa remake.
According to the latest issue of Famitsu, the folks at Square Enix (or, more likely, the folks at Racjin) are hard at work on a DS remake of SaGa 3, which will be called SaGa 3: Shadow or Light when it's released in Japan later this year.
Considering the SaGa 2 remake has yet to make its way to other territories, it's likely (and unfortunate) that this forthcoming sequel will remain a Japan-only release as well.