I think that I actually agree with Blackberry on this one, though I'd think this would fall into trademark territory more than patent technology. Maybe the curved ridges on the keys somehow have a patent I guess...
Rule of thumb: IP law is so complicated that it's safe to assume that (1) TFA got it wrong, (2) the Slashdot summary and title got it wrong, (3) all slashdot posters (including me) got it wrong, with the sole exception of NewYorkCountryLawyer. I think the only way is to read what the actual filing said, and then look up patents, and then look up the claims section of those patents.
As far as I can tell, Blackberry complained that Typo Keyboard infringed one or more of:
* US Patent 7629964 - a patent about the invention of a particular angling+placement of keys on a handheld mobile device where the keys are optimally placed and angled to allow two-thumb typing. It looks like there was thought and extensive user research into figuring out that particular angling and placement. While it was obvious that some kind of angling+placement would be good, I guess no one had done the inventive work to figure out that particular angling+placement.
* US Patent 8162552 - a patent about the invention of a particular ramping of individual keys for the same end. I know that HP had beveled keys before. This patent is for a particular angling and beveling and crest and so on. Again it looks obvious that some kind of beveling is useful, but I guess no one had done the inventive work to pick out this particular angling and beveling. It looks like anyone who used a DIFFERENT angling and beveling wouldn't infringe on this patent.
* US Design Patent D685775 - a design patent which is very specifically for Blackberry's design. Design patents are for the ornamental shape of a functional item, and only apply when the design is novel and not the obvious shape for devices. I guess we didn't have the particular Blackberry proportions or layout on other devices before.
* Blackberry's trade dress. Trade dress is about the recognizable look of a product, that would let consumers readily recognize whether something is distinctively a Blackberry from its distinctive shape, colors etc.
I don't know on the basis of which of these the temporary sales ban was enacted. But I do know that Blackberry keyboards are indeed nicer to type on than any other phone keyboards I've used, and it really does suggest there was something non-obvious about their research into key placement and contours and their particular results. And I do think that Blackberry keyboards have a distinctive recognizable look. From photos, that Typo keyboard really did look a heck of a lot like a Blackberry in both its overall form. If indeed it also copied the particulars of Blackberry placement/beveling, rather than using any of the INFINITE other possible placement/beveling, then it seems like a slam dunk for Blackberry.