Wait, wait, let me guess. The band has become bored of the power-metal style and wants to go in a progressive/hard-rock direction. The double-bass will go out the window, and so much for solos; all guitars will be heavily downtuned and the bass guitar will suddenly become oppresive. Catchy choruses are for the simple minded, so none of those--in fact, nothing that's fun to sing along with at all. Add five key changes and cut the tempos in half. There will also be at least one bizarre psychadelic minimalist section per song.
Pardon me, but yes, I have become a little annoyed lately with the best names in power metal doing major surgery on a successful style, pretty much always for the worse. I get it, I get the whole "not wanting to repeat the same album over and over," but the cumulative impact of it is starting to grate on me.
Prove me wrong, Stefan. :p