It's no big secret that Nokia is working on another tablet. Shortly after the launch of the Lumia 2520, rumors started floating around talking about an 8-inch equivalent of Nokia's first Windows RT powered tablet. Dubbed 'Lumia 2020', (Codename) Illusionist will reportedly arrive not before the end of March, 2014. There's still a long way to go, and by then the OS of choice might be Windows 8.2 RT and not Windows 8.1 (rumors say that Windows 8.2 will arrive in Q1 2014).
Take the latter half of the post with two grains of salt. Regarding the release date, we're pretty sure that Nokia will release their 8-inch tablet before mid-2014, if they have any such device in the pipeline.