thanks for the replies guys, everyone above is correct Gordon.
The app is already available although not officially launched at the moment due to a software bug.
You can download it now from iTunes, but there will be an update required within about 10 days time. fingers crossed from then on, it will be 100%.
full editorial will be featured here and elsewhere online once launched.
just for the record, i have pulled the app from windows7 market and android markets till itunes is 100%. so only avilable in iTunes just now.
Search for "Signapp" all one word.