The one problem is see due to the lack of hardware buttons is this..

Suppose you are using the full screen view of the web browser and you want to go to other open windows or applications.... In the n810 u can just click the multi-task button and select the window/app you want.

But for the n900 you need to go out of the full screen mode of the web browser by pressing the transparent button on the screen.. aka web digi@web, which takes you to the windowed web browser screen... then you click on the multi-task button on the top left corner.. and then again press the window/app you want to use...

If that is true.... that is definitely a regression.

In my opinion they should have all three hardware keys on the side of the device...They did not give us the 4.13 screen... they could have atleast given us those buttons.