Bibble 5 was released a few days ago. I used to be an enthusiastic user of Bibble 4, but over the last year I have transitioned to Raw Developer for most of my work, having never really liked ACR and not wanting to spend my time working with a beta product in order to be able to use my new cameras.
I did download Bibble 5 and it looks promising, definitely a complete update from the previous version. Haven't had much time to play with it yet, so I really cannot say how it compares to the other tools I routinely use.
I'd be delighted to see Bibble remain a viable alternative, but the long development delay seems to have deflated some of the enthusiasm that used to surround the program.