Well Katie bar the door (the old guys will get it)...
The former OpenWave, now rolled up in Unwired Planet, is prepping for another round of lawsuits targeting Apple (twice already), Google, Samsung and whoever else has a pocketful of cash. This time they come freshly armed with a parcel of patents courtesy of Ericsson. Just like Nokia, it appears Ericsson is on the patent monetizing hunt using outsourcing to 3rd parties as a cover. So go forth and file lawsuits brave U-P, and render unto Ericsson what is Ericsson's. Like at least 20% of the booty, and up to 70% of it if it's really good.
Of course, it's a bit more than just rounded corners. That's just shorthand for "rounded corners, display with even borders, a shiny bezel, and rounded icons". Those are Apple's claims in their design patent lawsuits. However, Apple themselves emphasized rounded corners above all else in their lawsuits. For examples:
It also didn't help that Apple claimed that NONE of those design items were functional (this is a critical claim, as they cannot patent a functional design element):
Which has led at least one world judge to respond that rounded corners sure seem functional for holding comfort to him, and that a flush screen makes sense to keep dust out of corners.
So yes, Apple is not just claiming rounded rectangles. They're claiming those in conjunction with a couple of other common design features.
That's why even the billion dollar California jury refused to convict Samsung's tablet design of infringing Apple's tablet design.
While Apple hasn't (yet?) tried to use it in litigation AFAIK, they have finally succeeded in getting their US patent for a simple rounded rectangle shape used in a portable display device. Since it's just a tad broad IMO, I don't personally see how Apple could successfully defend it if challenged.