I got it. They must have sent it to all alumni.
The wording made it sound like, to me anyway, that it was for this Spring.
It said "currently recruiting" as opposed to "will be recruiting".
They also said to send your resume into Casting Marketing which is totally off process from the typical way to apply for a professional internship.
"Currently recruiting" may be debatable, but because the message came from Casting Marketing instead of Professional Recruiting and because the instructions to apply were off process, I'm pretty confident that they are trying to find people for the Spring.
That's what I thought... but I wasn't sure, since they weren't really specific. Anyway, thanks for answering the question (and confirming my initial thoughts).