While I wouldn't put that song up with anything from EUIII's soundtrack (and it felt a bit lacking after "Montgomery's March" from HoI2), I always look forward to Paradox' musical offerings. Japanese Spirit from HoI2 was especially gorgeous, and I listen to it all the time. As long as the rest of the HoI3 soundtrack is more colorful or...I dunno...a little "grander" than that piece, I should be quite pleased with the result.
I will also take this time to be the nth person to draw comparisons with Williams. The inspiration is pretty obvious.