Interestingly, of all the platforms The Eternal Night released on (PS2/Wii/DS/GBA), the GBA version, a 2D platformer/brawler some described as Devil May Cry meets Astro Boy: Omega Factor, has the highest average review score by a large margin. Quality doesn't equal quantity sold, however, especially on a dying console, and we're not surprised that Sierra opted to not complete its The Legend of Spyro trilogy on the GBA.
Dawn of the Dragon for the DS is scheduled to ship in fall 2008. Based on the screenshots released so far, it looks to be another 3D action platformer with occasional sidescrolling stages. Mark Hamill will reportedly lend his voice to one of the game's characters, and Elijah Wood will return to voice Spyro. Christina Ricci will take over Mae Whitman's role as Cynder. We can imagine her disbelief over the replacement : "Her?"
For reference, we gave the DS version of The Legend of Spyro: The Eternal Night a 5.0/10 in our review (GBA version: 9.5).