The reason Google didn't release a N10 along with N5 this time according to me

Google releases a new version of Android with every Nexus release, correct? So it would make sense to launch a version with Nexus tablets which concentrates on tablet features, and another version with the Nexus phone which improves phone features. My guess is they'll launch new N7 and N10 together next year. What do you guys think? Does that make sense?