I hadn't really considered how much the change of angle in the OP picture might influence the shape of what we were seeing (the image sort of bends around the corner of the building).
View attachment 87109
Viewed flat, the beak might be more like the stout triangle of a cardinal than the slightly slenderer beak of a blue jay (though I'm not familiar with either bird, and looking at assorted photos there is some variation within species- but to me it looks like most cardinals have stouter beaks than most blue jays). L-R, detail from "flat" poster, northern cardinal, blue jay.
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Had a quick look online to see if cardinals, or the word/ title "cardinal" had any significance in UFOlogy.
Found this, which is very much from the "believer" end of the spectrum- perhaps the work of one person.
From the "Unidentified Phenomena" website, " Cardinal-3 UFO"
https://unidentifiedphenomena.com/topics/cardinal-3-ufo/
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I'd be surprised if this has much weight even within UFOlogy/ amongst UFO enthusiasts. No explanation of how the author came by this information is given (there's more description of the Cardinal-3 on the webpage), or why- if this material can be shown to be true- "disclosure", a theme repeated by the author, is necessary. Other pages on the website carry other extraordinary, uncorroborated claims.
I'd be surprised if this material has had any influence on Steven Spielberg (
Close Encounters used tropes from Ufology, but relatively well-known tropes).
Found this on IMDB about Mark Christopher Lee's 2023 documentary
God Versus Aliens,
https://www.imdb.com/news/ni64588462/, quoting Lee:
External Quote:
"The Vatican has been studying UFOs for decades and even has its own Cardinal appointed to deal with first contact. From my research I believe that this new guidance on apparitions is proof that they know that UFOs are more than just physical crafts from other worlds and that they have a paranormal side to them."
After the success of
The Conclave (2024), largely set amongst the Catholic Church's College of Cardinals, maybe Spielberg has decided to make a
Close Encounters/
Conclave mashup

))
Of course, though its fun to investigate possible hidden meanings/ allusions in materials like this promotional poster, there might not be any connection between the imagery used and well-known UFO cases/ theories in UFOlogy.
Successful SF/ Techno thriller movies can establish their own original tropes; there seems to have been an increase in reports of gray-like ETs resembling the
Close Encounters aliens after that film (although conceptually they weren't wholly original, reportedly being an amalgam of some witness descriptions).
Benevolent aliens have been visiting Earth to warn us about the arms race etc. since 1951's
The Day The Earth Stood Still*, released over a year before George Adamski met the Venusian Orthon in the California Desert,
https://en.wikipedia.org/wiki/George_Adamski
The poster design itself has already been at least partly successful, as it has attracted interest and online discussion, raising the film's profile.
*The theme of wise, peace-loving (or at least, "on our side") aliens in SF pulp fiction predates this, e.g. the Arisians in E.E. "Doc" Smith's
Triplanetary (Amazing Stories, 1934), but
The Day The Earth Stood Still must have been vastly more influential in promulgating the idea.