The songs are up to 15 minutes long, plenty of space for fast and slow. 15 minutes of just fast
He's described the songs in the past, there is fast songs, he said Storm was like a mix of Battle and Beautiful Death, the way of the fire is mainly faster... will be 50/50 which is fine by me (it is 80 minutes overall remember). Also, there will be much more clean vocals and choir parts. He doesn't want to repeat the first album, best do something different. Land of Snow and Sorrow is in Drop Bb, so heavy stuff too.
and he hasn't really been working on it for 10 years, they lost a whole years work and without the tech problems (money issues) it would have been out ages ago... last 5 years have just been a continuous circle. Pretty harsh to say he's a slow worker when working in unideal conditions.