what do you mean 'There's another Jedi' didnt we always know there used to be lots of Jedi? pretty sure I did.
As far as Yoda's death. I kinda cover this in the one of my really long posts so it might have been missed.
Basically, in one scenerio, after everyone is back at Coruscant there is a 'raid' on the Jedi temple and the place is destroyed (remember we never see the Jedi temple in the real OT) in the scenerio I gave, we would know that Bail Organa would be there (he's more running to a hangar) and we know that Obi-Wan gets off with Luke. We actually see Mace die and thats kind of the end of that, we dont know the fate of any other Jedi, except as Obi-Wan tells us in ANH, Vader hunted down and killed them all. The last shot we see of the Jedi Temple is it basically getting destroyed...so we would be lead to believe that all the Jedi in it died.
Now i could argue that we dont even see Obi-Wan get off the planet with Luke, all we see is them trying to escape maybe, and Padme's death...though this can be handled earlier on in the story, but closer to the end makes it easier to hide Leia from the audience's knowledge. If we know Padme is pregnant, we can have the whole introduction to luke (at least when we first find out his name) even be a suprise...so basically at the end of episode III every character except vader and palpatine are presumed dead (Yoda, Obi-Wan, Anakin, Padme and the child she gave birth to (we are unaware of a second child, Leia) of course we who have seen the OT all know that everyone there but Padme survived.
My one qualm with this, which prob isnt a big deal, is that we really have no suprise going from OT to PT. We see these people dying off, but we know they really didnt die...going the other way though, we would assume they are all dead until we meet them in episode IV...Owen Lars' comment about Obi-Wan dying about the same time as Luke's father would appear to be true.
-Darth Simon