If you haven't seen this season yet, the biggest and most interesting developments have involved Tara, who is unfortunately played by one of the least convincing actresses on the show. The other main development has been the forced alignment of Bill and Eric to work together under pain of "the true death."However, the second half of the season seems to be pretty exciting.Creator and Executive Producer of the first 5 seasons Alan Ball is ending his day-to-day connection with the show after this season concludes.
Apparently at the recently concluded Comic-Con in San Diego a trailer for Season 5's second half was released. You can see it at the top of this post.
hat/tip to Wonder Man