Hi Richard and welcome to the forums.
Now I can only give you some info because wel... I don't have it yet, some people in sweden are very lucky.
1. From what I have read the video playback is meant to be near DVD quality similar to the N95 though it is "only" 65k colours as opposed to 16million of N95 but some of my previous posts explains that is no issue at all, the few translated reviews I have read of the retail release say the video playback is good, would reccomend earphones though. small active view from
here go about 5 mins in
2. Push email amount does depend on the email itself, it you are on Vodafone UK I think our limit is 1GB, if you are only getting text emails then that will not be an issue as these are normally around the 25kb mark, it will be images and videos that you recieve via email that will cause the issue, though most phones give you the option of what top download.
3. I do not know, there may well be 3rd party applications that can do this.
4. 32GB SDHC MicoSD (only 16GB is currently available)
5. Again I am not sure the N96 is the first phone i know of to have this, it i more than possible that they are workibg on a mobile version however beware this is where your data limit will be exceeded