The one killer application for me is evopedia, which I use a lot on my N900; being able to search wikipedia offline for a number of different language wikipedias is simpyl phenomenal.
I would find it very sad if this would not be available on the N9.
Something like shazam for music recognition would be nice.
I emailed the Instinctiv team, who provided an excellent such tool on the N900 to see if they intended an N9 version. However, they seem to have abandoned Nokia
