AllThingsD.com Google, Inc. today unveiled a new tablet, after months of speculation that the search giant was developing hardware that would compete with Amazon’s Kindle Fire, and maybe, the iPad. The Nexus 7, made with hardware partner ASUSTek Computer, is a 7-inch tablet, built for Google Play, and is running the latest version of Google’s Android operating system, Android 4.1 Jelly Bean. The tablet boasts a 1280 by 800 HD display, a Tegra 3 chipset with a quad-core CPU, and a 12-core GPU. It has a front-facing camera, is Wi-Fi, Bluetooth and NFC-enabled, and claims up to 9 hours of battery life with video playback and up to 300 hours of standby time. It weighs just 340 grams, Google says, or about .75 of a pound.…