We here at Engadget are awfully fond of those hunks of metal, motherboards and magic we call smartphones and tablets, and Mobile World Congress is determined to gather as many as possible on an annual basis. Indeed, this year's show, held in beautiful Barcelona at the Fira Gran Via, is not just a weeklong event -- in fact, it's already started. A handful of companies have announced their key products in an attempt to gather some crucial pre-show buzz, but does that mean there's nothing left for us to hunt for? Absolutely not. Gather with us beyond the break and we'll tell you about everything that's already been announced, as well as what we can expect from the rest of the mobile extravaganza.Filed under: