Straight from Battlelog: "We are delaying the launch of Battlefield 4 Naval Strike on PC. We’ve detected an issue and it needs to be solved. Quality is our number one priority and we will not release Battlefield 4 Naval Strike on PC until we feel it meets the highest quality level possible. We are also working on a larger update to release alongside Battlefield 4 Naval Strike on PC that will address the issue of Tablet Commander not working correctly. Once we have a confirmed date for PC, we’ll be sure to update those players on our official channels. We appreciate your patience and look forward to seeing everyone on the Battlefield."
Guess we have to wait a little bit longer than the console fellas.
http://battlelog.battlefield.com/bf4/news/view/take-the-fight-to-the-sea-with-battlefield-4-naval-strike/