I came across this today on Facebook. Any idea how this fits into their stringent brand integrity plan, while Jedi Mickey doesn't? (And, yes, it is real.)
As others have stated, that doesn't appear to be Disney-released product.
That said, let's pretend that it is - I really don't see any relevance to the question of Jedi Mickey/etc. It doesn't involve the mash up of characters but of general concepts.
It's achingly simple - the mash-up of the characters is no longer desirable as both characters are under the same ownership. It serves no purpose, financially or from a narrative stand-point. It simply was done to produce more product to be sold at Disney Parks that Disney had a profit participation in, keeping the in-park Star Wars shops toy selection from being a clearing house for Kenner/Hasbro product or glorified "Toys R Us" outlet. It existed as a product category, nothing else - there were no tie-in films, story-lines, etc. Now that Disney gets all the Star Wars profit, period, it makes little sense for them to continue the co-branding (which, in fact, is dutifully ironic as they are undoing what apparently fanbois did not realize that Lucas had allowed for years; the "fear" of the uninformed fan-folk of what would happen after Disney took over and "Disney-fied" everything).
On the subject of the shirts and their legality, there isn't much likely there in the way of infringement. First and foremost, while I don't know anything about this vendor in particular, a lot of these limited T-shirt/print sellers actually do have some general license agreements with various entities that blanket cover the limited edition stuff they do (viralstyle seems to have some such agreement). They have access to certain clip art libraries (some are even available for you to design yourself, I believe) and many are on the up and up legally. Typically, these types of agreements say as long as they don't print obscenities/etc., don't produce more than X-amount, etc. they are allowed limited production of these novelties. I can't recall the name of the company, but I know I bought a print and a shirt a few years ago when they did the Princess Leia/Haunted Mansion portrait mash-up, given they had other park-related stuff I saw from that vendor it was pretty clear it wasn't bootleg.
But as I said, I don't know about this one in particular - even if they don't have any type of agreement, there really isn't much in that T-shirt Disney could object to legally. It's pretty clearly both a satire and a parody. The main thing to object to would be the image of the Death Star, but to be frank - given that it's a very generic image at this point, used in countless memes and is clearly being used in trans-formative nature here (in forming the mouse ears) that's pretty much the definition of "fair use" (think the "Unofficial Guide" and their sliced orange arranged as a Mickey cover art). The fact that it melds with another well-known image in a clever, arguably political fashion due to the juxtaposition of the two, in fact makes it likely parody as well.
TL, DR? LOL. /nothing more to see here, really.