Are there any new releases in the TES series coming up? Not asking about TES V, I mean spin offs, mobile games, books, etc.

There's a book coming some time, but we don't know when. But that is all. For games nothing is known and the http://www.gamesas.com/index.php?/topic/1115729-official-tes-v-speculation-thread-66/ should be used for that discussion.