Mmh, a title which sells almost 200k in its first days and then goes over 900k like 358/2 Days...hasn't just "not terrible legs", but good legs. Since it's an RPG, those are giant legs, even.
KH seems to be a good fit for consoles which are not only bought by "core gamers", but by other audiences too, probably due to Disney's characters / worlds being in the game. So, I expect KH:3D doing at least 600k-650k LTD in US in the long run.
However, the only ""possible"" indications about its sales so far are these.
Amazon:
KH3D Collector's Edition 20th for many weeks, now that the release is approaching it's costantly flirting wit the top 10. Instead, the regular edition is 179th. It seems everyone is preferring the Collector's Edition while it lasts, and it doesn't seem something so unusual. Halo 4, for example: the collector's edition is between 40th and 50th, while the standard SKU is 89th.
GameStop:
KH3D Standard SKU 18th in the Preorder Chart, KH3D Collector SKU not available online since some days.
Best Buy:
KH3D Coll. SKU 3rd, Standard SKU 32nd in the Preorder Chart.
Walmart:
KH3D St. SKU 10th in the Preorder Chart. No Collector sold at Walmart.
@jvm: I remember this too, Nintendo counts the bundles indeed.