Steven Moffat has indicated Series 9 will happenin 2015, and that it will be another Full Series, uninterupted run. Speaking in the latest edition of DWM:
“We’re not going to do splits, and the same format will repeat exactly the following year like that. So it will be the traditional form.”
Moffat also confirmed Series 4 and 5 of Sherlock, co producered by Mark Gatiss.