The new update is important for
1. Trim is included in 4.3 onwards..makes your tab faster
You would think so, but I haven't noticed any changes. Perhaps Samsung is not implementing it.
2. Air command for s pen ...unleashes the power of the s pen
There has not been any indication that we would get this feature. Chances are, we will not. If the Note 2 gets it, then perhaps, but if not, we're not getting it for sure. As far as I know, the Note 2 does not currently have Air Command.
3. Less ram consumption and faster on kit kat
While the first part is true, the latter is not. And Samsung is not including ART in their ROM as well.
4. Blue tooth LE. ..faster and lower battery consumption
Sure, but the bluetooth device would have to support it as well AFIK. In addition, we don't know if the bluetooth radio in our tabs is actually even capable of low energy. Since the hardware in our device is relatively old, it may not be capable and therefore not support Galaxy Gear. Looking at the Galaxy Gear info page, the Note 2 is not listed as being supported. Rumors say that Gear support is coming to the Note 2.
5. New flatter icons and UI....consume less system space....faster device
Maybe for stock Android, but TouchWiz is not changing.
6. Support for gear devices
Maybe. See above for bluetooth LE
The cons...
1. Knox bootloader
2. Sd card read and write issues
Both these cons can be solved by rooting and Dev help on xda
Sent from my GT-N5100 using Tapatalk 2
1. Maybe
2. Yes. Android 4.4.2 blocks 3rd party app access to the SD card. Easily fixed, but needs root like you said.
In summary, everything that everyone is hoping the get with the update will likely not happen, either due to hardware incompatibility or Samsung's unwillingness. Chances are, this update will be just like the update for the S4...updated status bar color scheme, a little better UI for multiwindow, and a version number bump.