The latest Privateer Insider with Jason Soles has more details about the upcoming Unbound mass combat rules for Hordes and Warmachine.
From their website:
Over the past few months I have been playing a lot of WARMACHINE and HORDES –truly large games with great masses of models on each side of the table. Games that engaged me on every level and challenged my over stimulated mind to constantly adapt and refocus on the rising and falling tides of conflict erupting across the tabletop. I have mounted cavalry charges in which three full units of Uhlans slammed into my opponent’s zealot horde. I have faced the massed might of six Wraith Engines (damn you, DC!). I have seen a tabled littered with dozens of wrecked warjack. These were the epic battles I have longed for throughout my tenure at Privateer Press.
Debuting in the pages of No Quarter 36, UNBOUND is a system for large-scale WARMACHINE and HORDES battles in which players each field 150+ point armies with three or more warcasters/warlocks. Unlike standard games of WARMACHINE and HORDES, throughout an UNBOUND game players alternate activating a portion of their armies each turn, activating every model and unit each round. On most turns a player will activate a battlegroup along with a few units and solos.