Ok from various posts on Twitter, on here, on Reddit I'll try to add some information so that people aren't asking the same questions:
Battery
Battery looks to be the same size, or smaller than the 8 but with the A13 processor so it is going to give similar battery life, however it's worth noting that this device was optimised to run the latest iOS. So for the older devices that have seen battery life decrease with updates, it will still likely be a big improvement for them and adequate for most people.
It will not come with an 18w fast charger, although it will be supported.
Camera
It would appear that the setup is the same as that of the XR (sort of, see below). However, with the advances that the A13 brought, computational photography from this device should be improved from that found on the XR.
There is no night mode, however this could be added in the future if Apple allow it with a software update, or maybe a version of it for this device that is still useful but perhaps not as advanced as the current flagships from that time.
It will only allow portrait mode of people, the same as the XR. That is for both front and rear camera. Again, the portrait mode should be further improved upon from that found on the XR.
Rene Ritchie has said in his video, where I am guessing he's been provided some information from Apple, that it's actually the 11 main lens, but with a few disadvantages such as night mode is missing, but the other areas should be really detailed and sharp with the A13 chip and the lens fitted.
Apps such as Neural Cam will also aid night shots for anyone interested who's not used the app in the past. It's not as good as Apple's night photography - but it's as close as anyone has got building an app.
Bezels
I still see people asking, but all bezels for this device are black. The white front is no longer an option, and I think this gives the device a cleaner look, reduces production costs, aids repair availability etc.
Prices
Those of us in the UK complaining that the exchange rate is giving us a really bad deal, it's worth remembering that the US price does not include sales tax.
Cases
Apple have three new cases available for the new SE. They are available to buy now in the Apple Store.
All existing Apple cases from the 7 and 8 will also fit the new device, no word yet on the Battery case however I cannot see any reason it won't work or fit.
Dual Sim
Yes, it has dual sim, although like the other iPhones that have it, the second sim is an e-sim option. But still, another unexpected feature.
Modem
Obviously this will be confirmed or shot down once the device strip downs take place, but it's looking more likely that the modem on the new SE is an Intel chip. It does however support WiFi 6 4G LTE advanced, an advantage to those with an older device.