Maybe it's too early to make a list (the iPad Pro recently will have a month on market), but this list can be useful for those who will buy it and want to know how useful could become this device.
These are the apps I use the most on my iPad Pro. The main purpose for my Pro is basically to use it as a compliment to my daily work life and as an entertainment device at night.
For work I use: - Notes app (iOS stock) - Procreate - Slack - Dropbox (doesn't support Pro resolution yet, sucks) - Mailbox (also doesn't support Pro resolution yet, sucks) - Sketch Mirror - Paper 53 - Notability
For entertainment I use: - Video app (iOS stock) - Netflix - Youtube - Tweetbot - Safari - Medium
On my iPad Pro, these are the apps I enjoy the most:
- iMaschine 2
- NHK World
- Prompt (omfg, this app is amazing)
- Word (seriously, it's awesome)
- Memopad (so good, but I wish it did certain things)
- Outlook (not joking here, Outlook for iOS is amazing, and this is coming from someone who was using CloudMagic on iPhone)
The apps I listed are totally usable on the Air 2. But the overall experience has benefitted from the iPad Pro's specs and peripherals.
- Apple Notes
- Paper by 53
- Coda for iOS
- Adobe Comp CC
For reference, I still require a Mac with OSX. But now prefer to use the iPad Pro away from the "office". As long as a suitable tabletop is available. This device is a joy to use two handed with the Pencil. Feels a little closer to analog.
Ugh, I wish I had the Pencil.