EDIT: I believe the picture is from the first episode. I can't tell, but if it is from the first episode, then why wasn't it included in the video with the other screenshots from episode one?
The pictures from "Episode 1" Is actually from the 1972 pilot, Neither IMAGICA or Masumi Jun [The two people/companys we know have copys of the show] Does not have the broadcasted episode 1
When you click on this link, you will be on a page with Japanese text and some Doraemon images. Go down until you see the area where there are 5 boxes, each with a different character (In order: Nobita, Shizuka, Gian, Suneo, and Tamako). Click on them and what you hear appears to be audio clips of dialogue from the 1973 series!
Well it looks like we're one step closer to finding Doraemon 1973, though I don't think we'll find it immediately, but perhaps within the coming months we might find something.