I have three shortish books published this year on medieval English history, covering Alfred the Great and the Vikings, the Norman Conquest and Magna Carta and King John. Two more will follow next year. The books will be published in the US (although also available on British Amazon) and are aimed at newcomers to the era; an older version of Horrible Histories, basically. The last is a much expanded version of my ebook on Magna Carta, which is how the whole deal came about.
The first will come out in June, sometimes between season two of The Last Kingdom and season seven of Game of Thrones.