All change for British Tourist Visa again
Latest from the British Embassy in Ankara is at http://ukinturkey.fco.gov.uk/en/help-for-british-nationals/living-in-turkey/visitors-who-overstay
So the tourist visa has for the time being reverted to it's original status of 90 days multiple entry following a meeting of British officials and Turkish officials. How long this is for though remains to be seen and there has been no clarification as of yet of the status of those that had the "new" visa.
The British Embassy has promised to publish new information as it receives it.