Okay, i believe i should make myself clear on this:
I know there's a whole heap of black metal bands and another heap of speed metal bands (and you can classify DT's music as any kind of metal you want and there's always going to be a whole heap of bands that play the same sub-genre). I also know In Flames, At The Gates and DT have a lot of things in common (the three of them invented the "Goteborg sound" together). What i was trying to say is the following: DT releases "Haven", and it's not like it's a copy of some other album by some other band (i haven't heard every single album by every single band, of course, but i'm pretty sure i can say there isn't another album that sounds just like "Haven"). Then DT releases "Damage", and same shit. And the same happens with "Lost" and "Character". That's what i meant by 'original'. So i think i'm on the safe side if i say DT's next album will probably be original.
I've heard (read on the internet, actually) a couple of bands say that their music is "similar to DT" or "a blend of DT, [band2] and [band3]", but i've never heard/read DT saying that their music is similar to [band]'s music.