Lostwinds & Lostwinds 2 have been removed from the Apple App Store due to compatibility issues with the latest versions of Apple's iOS software.
Lostwinds is now available to purchase for PC on Steam: http://store.steampowered.com/sub/97831/
Any future developments on Lostwinds will be announced on it's official site: http://lostwinds.frontier.co.uk/