I was about to post this. Thanks! There's subtitles but only in Japanese.
A few things I just spotted:
1. At 2:38 it shows the significant improvements in the viewfinder display. There's a lot more information available at the bottom of the viewfinder.
2. At 3:52 it shows the complexity of the new pentaprism system. I hadn't noticed how complicated it was to add all the information displays etc.
3. At 6:28 it shows a top view of a camera. I think this is the K1 not the K3iii. The K3iii is shown at 6:42. I think he was introducing the function dial.
4. At 6:49 I notice that there's an indication marked "AF Hold" (sorry I can't type katakana on this keyboard). Presumably this lights when you get AF lock and hold the shutter release half way?
5. At 8:30 it shows that there's five user modes. This is great, because I would really like to have more than the three on the K3.
6. At 12:04 he shows the AF pattern (and there's mention of f2.8 and -4EV limits).
7. At 14:23 he shows the weather sealing.
8. At 15:18 he shows the image sensor which has 25.73 million (2573*10,000) pixels.
9. At 17:05 he talks about a new sharpness setting called "Fine Sharpness II" in relation to "Fine Sharpness" and "Extra Sharpness". (I'm translating the katakana)
PS The Japanese have this curious anomaly in counting where after 1,000 they count in multiples of 10,000 and multiples of 100,000,000 (ie 10,000 * 10,000). So that's why the pixels in the sensor are counted in multiples of 10,000. I believe that this goes back to old counting systems in China which are no longer used. The Japanese also retained counters which are no longer used in Chinese eg. counters for people, small animals, large animals, rice etc etc. So counting things in Japanese can be extraordinarily complicated.