OMG THAT IS SO EXCITING BECAUSE IT'S NOT AS IF EVERY OTHER DREAM THEATER ALBUM HAS ACOUSTIC ON IT TOO!
OMG I hope they have some vocals on this album too!
But they've actually said something specific this begins the flow of actual information. Or at least that's how I see it.
That's not what I'd call specific. You could have safely assumed there was going to be some acoustic on it. It indicates progress, which is great of course, but it doesn't tell us anything new.
Now, if they'd said "Just recorded some banjo tracks for the new album", THEN we'd have something!