Yeah, the profile of this machine looks radically different than the profile of an iMac.
People forget that almost all all-in-one desktops are effectively just clones of past flatscreen stands/mountings, with computer bits crammed in, the bended metal stand of the iMac already existed as a mounting choice for some monitors, then from a design standpoint Apple effectively just stuck an extremely thick monitor on the bended stand.
The only exception to this was the sunflower iMac, which I don't remember seeing any monitor with a stand/mounting system anywhere close to it (though perhaps there were some in the medical field that had similar types of articulating arms, just mounted to hard surfaces), and of course even that mounting system wasn't that different than many amazing lamp/mirror designs, they just stuck a monitor on the end instead of a lamp/mirror.
This whole design recrimination thing is rather silly way to treat these design choices. Any field that has similar bare minimum elements/requirements and is focusing on functionality instead of artistic flare, only has a small number of design choices within the chosen design philosophy. Minimalism when applied to tools will only produce so much variation, the stand on this thing itself certainly qualifies as being quite different.
Yeah, it does look quite a bit different in most of the press shots than it does in the first post of the blog. Similar, but not enough that I would be that upset about it.
The keyboard and trackpad though? Blatant ripoffs.
A stand which is very "unMaclike."
Images here: http://www.ubergizmo.com/2012/09/hp-spectre-one/
It's not as if HP just entered the all in one PC market.
And this one may get something the iMac's probably won't - a touch screen.