@geekmaster: They already updated the fonts in FW 4.1.0. (A change that *hasn't* been propagated to the Touch... Go figure). Which makes me think they're actually talking about the 4.1.0 changes, unless they shipped a forked FW with the exact same rev/build number...
@Klif: Another sure way to differentiate the devices is by their 'device code'. The easiest way to check said device code is via the S/N of the device: The 'old' K4 S/N begins with B00E = the K4 device code is 0E

. Since we're talking about that, I'd like to confirm that it's still B00E on the 'new' K4 (I've heard reports of it being B023, but that seems a huge jump to me... On the other hand, they did release a crapload of Kindle Fires, so, who knows...). Could you check yours?