Wuaki.tv is preparing to launch 4K Ultra HD content for its smart TV customers. The Rakuten-owned streaming service demonstrated its new 4K streams at IFA 2014 in Berlin, which will be available to British and Spanish subscribers later this year. The new app, due to launch later this year, has been demoed on LG and Samsung smart TVs. It’s not known for sure which smart TV platforms the new Wuaki.tv app will land on first.