FAQ - at least started by the author: http://www.lead-adventure.de/index.php?topic=80477.0
Unofficial errata collated from above thread: https://drive.google.com/file/d/0B2_A_u ... NTalU/view
This s from the author on group activations:
During the wizard phase, you can activate your wizard and up to 3 soldiers who are within 3 inches of him when the phase begins (so where the wizard starts the phase). It does not matter what order these figures activate in. You could activate the three soldiers and then the wizard. So, picking a figure, the player completes both actions for that figure then moves onto the next.
The above is standard activation it is NOT Group Activation. Group Activiation is a special move which allows you to activate the same figures, but instead of activating them one at a time, you make all of their first actions together. This has to be movement. Then each can take a second action, one at a time, in whatever order the palyer chooses.
In point of fact, Group Activiation doesn't do anything that can't be done with normal activiation. It is just in the rules to make it easier for a player to move figures like a little unit if he wants, so that it is easier to keep their relative positiosn organized.
So we played it slightly wrong in that a model activated within 3" of a wizard isn't necessarily classed as a "group activation" and each (up to 3) could activate indepently and choose which order to take their actions (don't have to use move as their first action for example).