Remember those Ativ Tab and Ativ S trademarks we saw just a couple of days ago? They may well be more than just Samsung's daydreams. As long as details at The Verge prove true, the devices attached to those names represent a two-pronged revival of Samsung's Windows-based mobile strategy. We're most interested in the Ativ S: thanks in part to Windows Phone 8's multi-core support, it's effectively a