I love a good down theme answer puzzle, when the revealer shows you why the constructor chose to put the puzzle in that orientation. It does occur to me though, that there are likely many many potential themes that would rely on the across orientation, which likely don't make it to print because it's the standard way crossword puzzles are built.
In any case, today, our revealer comes at 26D: "Get it together! ... or a hint to the highlighted letters (SHAPEUP). And indeed, in the circles you'll find various geometric shapes hidden if you read up, within the longer theme answers. Three of the four follow the expected rule of having the hidden words cross over the theme answer words, such as in MICHAELCRICHTON, where "circle" uses the last two letters of the first name and the first four letters of the last name. The fourth, FLAVOROFTHEWEEK, which hides "oval" in just the first word, is therefore nominally not as strong. And yet it's such a great phrase that I can easily overlook it.
Interesting that two of the shapes are two-dimensional, and two are three-dimensional. I suppose in my mind I think of shapes as being different from solids, the latter referring to 3D objects. But I think I'm RUMInating too much on the subject.
In other areas, I love the phrase HOTSECOND. Does it go along with aforementioned flavor of the week?
My favorite clue came at 67A: Is the pope Catholic? (YES). Not in fact a QMC, here. Just a straight up question. I'm not sure I've ever come across such a thing before. But it made me laugh out loud.
I also liked 57A: Where Boxing Day comes before Christmas, in brief? (OED). Way to spice up an acronym. Sadly, the same can't be said for RFID.
Anyway, the reorientation mixes up the HUMDRUM run of standard crossword puzzles (far from humdrum, in fact, but you get the idea), and is welcome. Nice puzzle!