As expected, Google has begun rolling out its Android 4.2.2 Jelly Bean update to a number of Nexus devices, including the GSM Galaxy Nexus, the Nexus 7, and the Nexus 10. The software comes with the “JDQ39” build number, and it delivers fixes for a number of key issues — most notably a Bluetooth streaming bug.

Google is expected to release its Android 4.2.2 Jelly Bean update later this month, making performance and stability improvements that will first arrive on the Nexus 4, the Nexus 7, the Nexus 10, and the Samsung Galaxy Nexus. It’s likely to be the last Jelly Bean update Google releases before announcing Android 5.0 Key Lime Pie in May.

Mobile chip maker Qualcomm has inadvertently confirmed the spring unveiling of Key Lime Pie — the next-generation of Android — in a leaked document that details the development of Google’s platform. We had expected Google’s announcement to come at Google I/O in May anyway, but this should quash any doubts you may have had.

Rumors surrounding the Sony Xperia Tablet Z first surfaced last week, and we expected Sony to confirm them at Mobile World Congress in Barcelona next month. But in Japan on Monday morning, the new flagship tablet was unveiled. And boy, does it look good.

The iPad may be the king of tablets in some markets, but Apple’s device cannot compete with the Nexus 7 in Japan. Its premium price tag is causing tablet buyers to opt for Google’s 7-inch slate instead, despite its smaller display and lack of a rear-facing camera. One survey of Japanese electronics stores has found that the Nexus 7 has claimed 44.4% of the tablet market.