actually no, Clove UK (they wrote it on their public blog) has confirmed that early galaxy note 2 shipments did not have the updated roms installed, and that those notes without the feature will get an OTA soon. Some UK note 2s have already been confirmed by xda forum posters who received them as having the newer rom.

But for anyone reading here, I am sure flashing a new rom is not an issue, and I am sure the correct rom will be up soon enough.

as for n900, yes n900 is better at maintaining multiple tasks, but it cannot multi window afaik. for me multi window is something new for a phone (outside of overskreen browser)