Well, I just finished watching it... WOW!
Coming into this with moderate expectations after reading mixed reviews (probably from stupid kids), I can say Beyond the Clouds is a really great film. It's 'typical' Shinkai in that it values sentimentality, driving emotion and symbolism over pure action. 'Voices' fans will find a lot to love here.
Based on the action seen in the trailers, I can see why many would be disappointed, this is not an action show; it's a very romantic, personal drama flowing over a futuristic world war. The animation is drop dead gorgeous; slightly unconventional, often dream-like yet wonderfully scenic and beautiful.
It's well worth 9 out of 10. Outstanding- the best anime movie I have seen for a long time (since Millennium Actress).