Parmandur
Book-Friend, he/him
So, Jeremy Crawford has confirmed that the Subclasses from the recent UA were rejected, and have been replaced with "Magic Collefe" Feats that broaden the possible PC types at any rate:
"'The Unearthed Arcana playtest did the job we asked it to do,' Crawford said. "Occasionally, we put some very experimental things in front of D&D fans and ask them if they want to see more of it. In this case, the very simple answer was 'No.'"
"'We learned two really important things from this playtest that reinforced something we've been seeing from the D&D community going back to D&D Next (the original playtest for Fifth Edition rules)' Crawford continued. 'People love for D&D subclasses to speak to the distinctiveness of a particular class. 5E fans also want subclasses to be usable in as many subclasses as possible, since so many DMs homebrew their own settings. In this case, there was a bit of an uphill climb since the subclasses were so tied to a particular setting, that being the magical college of Strixhaven.'c
"Crawford noted that they were prepared for the fanbase to reject the subclasses and had prepared "contingency plans" in case they didn't work out. The subclasses will be replaced with other character options, such as feats tied to each specific college, which will support even more character types than the subclasses would have. We could also see some design elements appear in future D&D products in another capacity. Various new magic items (including magic textbooks) will also appear in the book to help players feel tied to their chosen Strixhaven college."
comicbook.com
"'The Unearthed Arcana playtest did the job we asked it to do,' Crawford said. "Occasionally, we put some very experimental things in front of D&D fans and ask them if they want to see more of it. In this case, the very simple answer was 'No.'"
"'We learned two really important things from this playtest that reinforced something we've been seeing from the D&D community going back to D&D Next (the original playtest for Fifth Edition rules)' Crawford continued. 'People love for D&D subclasses to speak to the distinctiveness of a particular class. 5E fans also want subclasses to be usable in as many subclasses as possible, since so many DMs homebrew their own settings. In this case, there was a bit of an uphill climb since the subclasses were so tied to a particular setting, that being the magical college of Strixhaven.'c
"Crawford noted that they were prepared for the fanbase to reject the subclasses and had prepared "contingency plans" in case they didn't work out. The subclasses will be replaced with other character options, such as feats tied to each specific college, which will support even more character types than the subclasses would have. We could also see some design elements appear in future D&D products in another capacity. Various new magic items (including magic textbooks) will also appear in the book to help players feel tied to their chosen Strixhaven college."

Dungeons & Dragons Scraps Controversial Playtest Subclasses from Strixhaven Book
Dungeons & Dragons has opted not to move forward with five subclasses that could be used by multiple player classes in their upcoming book Strixhaven: A Curriculum of Chaos. Lead rules designer Jeremy Crawford confirmed that they had scrapped the subclasses, each of which corresponded to one of...
