I am very content with Order of Ecclesia, as I usually am with Castlevania games. Currently, without adding in SC4 and SotN, my favorite games look like this:
PoR>HoD>AoS>OoE>DoS>CotM
The music is very sexy to hear now, but I also definitely love the music from other Castlevania games. The music playing in the Entrance Hall and Bloody Tomes makes me excited to take on Dracula and kick his ass instantly. The bosses were all original(Ignoring the usual cup of Death and Dracula) and pretty good. The gameplay is flawless as always, and made more intriguing because of the Glyph system. And I absolutely love the new bestiary, which is like 90% original sprites.
In conclusion, Konami/IGA could/should easily/conviently create/construct a sequel/prequel to Order of Ecclesia/Order of Dracula.