EA's Star Wars website has details on content coming this spring to Star Wars Battlefront, including a new expansion as well as free content. Here's word:

We are always listening to community feedback and working to improve the game, and are very excited about what’s to come. In the next few months all players can look forward to free* additions like:

• New In-Game Events - more double score weekends, community missions and Special Login Events are coming for players to earn more experience, credits and items.
• New Hutt Contracts - Unlock powerful Star Cards like the Berserker Trait, Bacta Bomb and Ion Neutralizer.
• More New Content - We also have a couple of surprises in store that we know our fans have been looking for, especially those who have been clamoring for ways to have more options to enjoy Star Wars Battlefront offline. More to come soon.
• Specific for May the 4th - In celebration of Star Wars™ Day we have cool activities planned that we’ll announce soon.

This June, Season Pass holders will also receive our second digital expansion pack, Star Wars™ Battlefront™ Bespin. We’re taking players in and around Cloud City, with four new maps for all of our most popular modes. You’ll see AT-ATs in Cloud City, take to the skies in Fighter Squadron, and even spend time in a carbonite chamber. Of course, we’re also adding more blasters and Star Cards, a new game mode, and two new iconic characters we’re really excited about – Lando Calrissian and the cold-blooded bounty hunter, Dengar.