No patent or trademark is the culprit but rather the design (as in: look) of the enclosure. Above article does link to this document: http://www.scribd.com/doc/61944044/Community-Design-00018160...
That’s called a community design, it’s an EU thing, here is the Wikipedia article: http://en.wikipedia.org/wiki/Community_design
This article deals a bit more with community designs and especially the concept of the “informed user” that is somewhat central to them: http://www.linklaters.com/Publications/Publication1392Newsle...
Here are images of the current iPad: http://www.apple.com/ipad/specs/
Here are images of the Galaxy Tab 10.1: http://www.samsung.com/global/microsite/galaxytab/10.1/spec....
(My personal opinion? It seems absurd to me that you can protect something vague like this. The Galaxy Tab and the iPad seem sufficiently different to me as to not cause consumer confusion.)