As far as I am aware nobody pulled out of the bill. Twang and Geoff have been having to wait to announce two acts. One being the headliner which we now know is Frost*. The other they can't announce till the end of the month. Both were delayed due to legal/behind the scenes band managent stuff. Or maybe just to build up excitement!
After reading a few tweets I'm pretty sure Frost* is safe. Apologies for posting the footage etc. Seemed a positive exchange. As for the new project I will not be surprised if a few more names are added to the list judging by the twitter talk.