A third trilogy is being planned, set to take place "in the early days of computer programming" and with novels set to release in 2025, 2026, and 2027 respectively. Mistborn: Era Three—Book One - 2025 Mistborn: Era Three—Book Two - 2026 Mistborn: Era Three—Book Three - 2027 " ... I plan to write Era Three (three books long, 200-250k each like the original trilogy) all in a row. I'll need a few years on that project, so goal is tentatively to see those start being published in 2025 or so--with one a year for three years after that ... " Source: Brandon Sanderson