Aerial tracks (and Kate interview snippets) have started to be played on BBC Radio today:
Pi: introduced by Kate - can be heard here about 1hr 43m into the stream of the show.
Joanni: pronounced "Joe-anni" - was played at 1hr 12m here. Smooth, elegant and as vaguely calypso as "King Of The Mountain." The synths remind me of Experiment IV for some reason.
Nocturne is here and go to 53 mins into the show. Note that Cunty Bitch is right - this is a very good song. It seems very contemporary until it goes into a kooky chanted bit at the end (think "Ninth Wave").
Somewhere In Between is here at 1h 7m into the show. Classic sounding Kate midtempo ballad. The male harmony voice reminds me of some of her older work.
How To Be Invisible is here at 2h 10m into the show. It's guitar based, sort of rhythmic and meanders along with a minimal melody.
From the Kate Bush News and Information site