The Vivo Tab RT was one of the products that ASUS had at its booth at IFA 2012 in Berlin, Germany, but only now has the item been officially adopted by carriers.
Even that is a bit of a stretch really. Though AT&T was quite verbose in its press release, it isn't about to start shipping the tablet. Instead, it will launch it later this quarter (Q4 2012).
Some of the assets of the product will be ordinary (32 GB NAND storage, 10.1-inch display, quad-core Tegra 3 TE CPU), but some won't (trial version of Microsoft Office 2013, ASUS TruVivid technology, 4G LTE support).
At this point, we only need to know what the price will be and we have all we need to figure out if this is worth buying or if something else on the market is more convenient.