Most of the features you are taking about are Samsung implemented features.
- Calls over 3G can be done using any 3rd party app.
- even mhl is proprietary to Samsung.
- If air view and all were to be implemented on AOSP&CM based roms, wouldn't it have been already done as it was there in Samsung 4.1.2. So why to wait for 4.4? Most of these roms are not specifically made for stylus phones.
- Multi-window does work. Still under development. Although there are a lot of floating MW options.
- About handwriting recognition, it's used in Samsung keyboard. Again Samsung.. If you just want recognition, there are apps to do that.
You say it's not a ETA thread but keep updating it with your own posts every day. If you asked this to any Dev, why not wait for one to read and answer?