It was just teasers, speculations, rumors but not anymore. Supercell has just officially announced Town Hall 13 and shared an official video of the same.
The announcement stated, 'we are officially revealing the design of Town Hall 13 and the Giga Inferno. Upgrading to Town Hall 13 will unlock several new features, but over the coming days we’ll be sharing those details. For today, we’re focusing on the star of the update: the Town Hall. In order to upgrade to Town Hall 13, you will have needed to fully upgrade your Town Hall 12 - including the Giga Tesla.'
Furthermore, the teme of Clash of Clans Town Hall 13 has also been announced, which is 'Dark Elixir and Ice.'