Originally they said 16 episodes in the final season. Now its looking more like 8 episodes in a season 5a and season 5b as described above.
However they do it, I do hope these are the last 16 episodes.
The show has been excellent, but I'd like to see the show end with a solid finish than them drag the story out for years and make me lose interest.
They have an opportunity to go out really strong, telling a complete story. I really hope that they commit to it and refuse any offer to continue it beyond another 14-16 episodes.
Far too many shows overstay their welcome and I pray Vince Giligan is smarter than that.