It shipped! X-Plane Mobile is now available for Android phones - look in the Android market under "X-Plane 9".
Edit: Chris sent me this QR Code - scan it to go to the store listing.
Edit: if you either cannot see X-Plane in the Android market or you cannot download it, please first look here for trouble-shooting tips, then contact customer support (info at x-plane dot com). Please do not use the comments section of this blog for customer support; if you need help we will need to contact you one-to-one.