It appears official. The Sarah Jane Smith Adventures will cease production due to the death of lead actress Elisabeth Sladen.
There are no current plans for the character to regenerate or replace Sarah Jane with a long-lost relation to carry on in the role her passing created.
There is no word yet on how the SJA series itself will end but six episodes have already been filmed and are in post-production. If the show ends with other than a farewell to Ms. Sladen then I speculate the final episode will have something to do with the TARDIS and Sarah Jane departing off-screen for an adventure. And if the Doctor is going to make an appearance for the sake of closure I’d really prefer it to be Tenant over Smith.