It doesn't necessarily indicate that there is to be a single... although I wouldn't dismiss the possibility entirely. I think it is more likely to be that 'Singing You Through' has proved so very popular and UCJ are using it to their advantage which is a very good move on their part.
I didn't know Singing You Through was so popular with everybody else, as i feel this is my favourite from the album. I think it has intimate meaning. I also love The Sound of Silence too. Nimrod is a much loved track of mine also, but i downloaded it from iTunes when it was released on the second release of the first album so i didn't consider it a 'proper' track of the second album, as i already had it when i bought Into Paradise. I hope that wasn't too confusing!
I think that everybody has been surprised by how popular 'Singing You Through' has been.
Although I loved the song when I first heard it, it wasn't really until I had heard the girls performing it live that it really stood out to me. It is a stunning song.
Sancte Deus (Nimrod) is also one of my favourite songs too. It is the one song that I haven't yet seen the girls perform live which I would love to see them perform. Hopefully they might do that on the tour.