I was wondering this, seeing as apple's apps first take a design overhaul before migrating to the ipad, and I 've not heard anything about these two...
The iDisk app is a non-native App (like Apple's remote App). Presumably you'll just install it via App store like you did with the iPhone(or when you sync with iTunes for the first time.
the Voice recorder App doesn't appear to be included so if you want this functionality you'll need to use a 3rd party app.