We knew we were going to get to spy some sleek new devices from AT&T today, but the company sprung a bit of a surprise on us at the last moment by announcing that it would also have a few Windows 8 tabs on hand running on its "blazingly fast" LTE network. The Samsung ATIV SmartPC, which has also gone under the name Series 5 Slate in a few other circles. The 1.5GHz Clover Trail chip inside hummed along in our brief hands on, chewing through the gorgeous don't-call-it-metro UI with relative ease and loading a few apps and webpages with nary a pause. With 64GB of storag