The FOX TV UK website has added a page for Da Vinci's Demons. Apparently promo teasers for the show were aired during The Walking Dead broadcast tonight.
They didn't actually mention Da Vinci's Demons, but instead promoted a link to www.hisstoryisalie.com. Clever!
There is only this background image on the site so far. Look out for more being added.
The date for UK broadcast on FOX UK is 10pm on 19th April 2013.