It’s not exactly a second season, but Firefly fans should still be excited to see that the show just got a special edition 15th anniversary Blu-ray release last month, and you can save a few bucks off MSRP by preordering.
Details are a bit hard to find, but it appears that the contents of the discs are unchanged from the original release. That said, the set does include some nice box art, a map of the Verse, and what appears to be small postcards of all the cast members?