Is it because nobody will use it?  Joking aside, Clem has just announced on the Linux Mint Blog that the next version of this distribution (corresponding to Ubuntu 12.10) will have the code name: Nadia.
You can see the reason behind the name on the blog (hope in Russian, delicate, tender in Arabic) , and as usual, this version will have variants in Cinnamon , MATE , KDE , and Xfce . So there you have it, Linux Mint Nadia in the coming months 