Samsung has just announced the Galaxy Tab 3, a 7-inch successor to the Galaxy Tab 2, and although the new numbering suggests a reasonable level of upgrades, the device looks almost identical to its predecessor and is scarcely much more advanced when you peek at the specs. The slate, which runs on Android Jelly Bean 4.1, is perhaps more of a refresh than anything else, although in yet another move by the Korean company to blur the line between smartphone and tablet, a 3G model will emerge next month with calling capabilities.