No question that Nokia has disappointed his lovely customers with there first update that only enabled few of thing for them and moreover the problem faced during and after updation(like brick, or dead device) were ridiculous, however for the next update First thing, it should be test enough so that no tablet device get dead or bricked while or after the update.
And next what we all can say that the features which were expected really from the device didn't came along with the device,
However if Maemo or Nokia again fails to introduce these must features in N900 through their next update for device, then there would be fall in the market of N900 without any questions and a big question on NOKIA CUSTOMER SATISFACTION, because I am also N900 user.
About the features that must be in Next Update:
1.Portrait Mode
2.Video Calling through secondry camera
3.Night mode for camera
4.Fully customizable menu
5.Hand Writing Recognization
6.Ultimate Volume controller(that can handle audio outputs from different apps and adjust accordingly the user, as in windows vista because if we are playing a song and a game simultaneously, then you have to choose one among them which is hurting)
7.All files sending through bluetooth, without the usage of any 3rd party software e.g Petrovich.
8.Infra Port enabling, as per listed here http://www.gsmarena.com/nokia_n900-2917.php
[B]9.Command Dial

Other common features:
1.Zooming the picture in the same way as done in browser in N900
2.No exit from menu after selecting an app from there(example if I select sketch app from more, then more window will exit automatically)
3. Quick detection of all hardwares connecting to the device
4.More application memory availability, although this is the minor one.
5.Removal of all the bugs or most of the bugs as per listed on maemo.org for N900.

In this way the NOKIA can again produce a WONDER and ATOP CUSTOMER SATISFACTORY MOBILE BRAND ON EARTH for his lovely and precious CUSTOMERS.