WarnerMedia is joining TV business’ transition from linear broadcasting to digital streaming with its upcoming subscription service headed by Kevin Reilly, who also oversees TBS and TNT. Reilly laid out the plans for the new platform at TCA today. When asked about the future prospects of the linear Turner networks TNT and TBS, he stressed that, while the company is evolving”, with “things syphoning through different platforms”, “we believe that when everything settles, we…