Is the new eagle card which comes with the 5th player expansion titledNeither. It is just "The Eagle."
'The Bald Eagle', or is it a 'Golden Eagle'?
The working title was "Golden Eagle" and I think that is still referenced in the rules. Just like "The Bear" was known as the "Black Bear"
What comes in the 5th player expansion is the same as what comes in the basic game (types, not quantities) as it is just giving you more cards to support another player.
The expansions (which might have been Kickstarter Exclusives) are the Grizzly Bear and the Bald Eagle. [ ETA: it looks like the Grizzly was also packaged with the 5th Player expansion. But the Bald Eagle is till separate, I think - I got everything with the KS version so not sure how things are packaged for retail ]
So to recap:
"The Bear" and "The Eagle" in the base game
"The Grizzly Bear" and "The Bald Eagle" are expansions.
"The Black Bear" and "The Golden Eagle" do not exist except as errata in the rules.