@sugarbasil: Their latest album was "All the BEST! 1999-2009", which was released in 2009! But, well, it was more like a "Best of", so I'm not sure, if you can really call it "new album".
I guess, Arashi latest albums with new songs were the "TIME"-album, which was released in 2007 and the "Dream 'A' Live"-album (2008)...soooooo, in my eyes, it's really time for a new album!
And about the new songs...not everbody likes the same songs. I love both, "Troublemaker" and "Monster" (I haven't heard "Spiral" yet!), but "Monster" a bit more.
It's really different for everbody!