I know it's little consolation for the inevitable, but it's worth reminding people that Beasts, Bonesplitterz and Sancrosanct will all get Index battletomes at the start of 4th ed. They won't be updated, but you still have about a year of playtime left with these models.
Again, it doesn't alleviate the pain, but these guys aren't dead quite yet. I say enjoy them while you can.