Sadly MTM, your guess is as good as mine. It was something the Official Twitter account posted and said, "Caption This". Others responded saying shame it wasn't out for the PC, and their official twitter account said have you checked out the recently released Toy Box for PC? Another commented that yes, they were going to check the PC Toy Box out, but they'd hoped it was for the full PC version, to which the official Twitter account responded, "You never know what could happen in the future! #ThereAreNoRules" (I've updated my earlier post with a more clear link to the Twitter post.)
Maybe this was nothing but an attempt to drum up traffic for their Twitter feed as we push headlong into the holiday shopping season. It was just odd to me they used that non-labelled platform graphic (which is normally how PC Box Art tends to look compared to console versions) with just a caption this. My apology if I made it sound like I knew something more - if only I did