Edit: Now with pictures:
Hmmm, it seems like somepony's missing . . . Somepony who is one of the mane six. (No, she is not on the narrow sides, Rarity and Scootaloo have that honor.)
And, yes, it really is $40. I took pictures of it away from the Canterlot display, though, because there was an employee hanging around and sometimes they don't like people taking pictures.
I was wrong about it not saying Luna's name--it says it on the sticker next to her that says "Press the button!" And it actually is two stories, not three like I thought . . . I was just remembering how tall it was compared to light-up Twilight and Starbeam Twinkle's "castle."
Sorry if this is old news! Also sorry I don't have any pictures--that will teach me not to bring a camera when I go pony shopping!
Anyway. Target now has a set called "Canterlot Castle". Frankly I'm disappointed because the "castle" is CARDBOARD. I mean, it does have rugs printed on the "floor", etc, but still . . . cardboard? Cardboard. And it costs $40.
It comes with Shine Bright Princess Luna (her wings light up--her horn doesn't), Spike the dragon, and non-light-up Pinkie Pie.
Pinkie Pie is in the "bent knee" pose rather than the "all hooves standing flat" pose. Otherwise she looks like "normal" Pinkie Pie. Spike is in the same pose we've seen him in before. Oddly, neither Luna nor Pinkie Pie's name appear anywhere on the box. O_o There's just the same blurb about Princess Celestia living there and all the ponies wanting to visit there that's on all the Canterlot merchandise.
There are a lot of accessories, at least some of which were from the G3 Ponyville line. There's also a pink recolor of the mouse that comes with single-version Pinkie Pie, the carriage that comes with that one set with Rarity, the telescope from the G4 balloon set, some barrettes, Ponyville fridge, a little vanity (I think it's also Ponyville), a treasure chest, and other accessories I can't remember offhand. Lots of accessories, but nothing mind-blowing.
I didn't buy it because, well, $40!! It's at the Target in Seattle in Northgate Mall, if any Seattlites are interested. Oh, and they also have bedsheets and the new plush Twilight. I did not see the main six in dresses set, though.