Well it looks like people at Nokia have tried really hard to release N9 even if it has problems. It is far from polished and I have hit some critical functionality that has API but is not working on Harmattan (most probably it works on Symbian). As well there are some functions that do not work from UI. I have reported bugs but that's the best I could do (maybe I can fix some of them). Overall I love how MeeGo Harmattan works and I love this OS - I'm happy owner of N950 (I'm using it as my main phone without problems).
Here is another thing that looks suspicious. New feature phones (that will run Meltemi) will have 1Ghz processor and as far as I'm aware N950 must have processor like this (at least I was hinted that it has slower processor than N9). Here I don't get why new OS is written when they have working one. As well it looks illogical to waste experience gained during Harmattan development (having in mind that Meltemi is developed in Germany and not Finland). It looks like not everything is revealed yet from Nokia side.
The first update is almost released with 3500+ improvements. The current software was ready in spring already and they have been working on the first update since. Also, I think the software on N950 is somewhat older/different release.
Meltemi is supposed to have different kernel, and it's really targeted at very low-end, in feature phone markets. Although, very low-end is 1Ghz in a couple of years.
Here is another thing that looks suspicious. New feature phones (that will run Meltemi) will have 1Ghz processor and as far as I'm aware N950 must have processor like this (at least I was hinted that it has slower processor than N9). Here I don't get why new OS is written when they have working one. As well it looks illogical to waste experience gained during Harmattan development (having in mind that Meltemi is developed in Germany and not Finland). It looks like not everything is revealed yet from Nokia side.