2. Floor hardly used operatic vocals. Only in the beginning of The Greatest Show on Earth. I just read in an interview with Tuomas, in a part where he talks about that style of vocals, that it isn't just a matter of doing things because they can be done. It's more about doing what the song needs. Apparently, only that last song had a moment where he felt such vocals served the song.
3. Melodic guitar riffs / lines are prominent (again). At times, I really was taken back to the first two albums. So, the Stratovarious influenced style has returned to a certain extent.
4. Emppu shows some very sensitive guitar playing. I distinctly remember a passage where he did his thing with such a feel. I am very happy with his role in the band, and glad that he was given room to contribute to significant moments in songs. Of course his rhythm work is already very present, but now he gets more spots where he is the prime instrument, e.g. in calmer pauses, or where bombast takes a break and then he carries the thing to the next phase.