I haven't gotten to play BL in many months, to say nothing of the Heroes expansion. I'm really looking forward to heroes, especially for campaign play.
In general I think that battle savvy will also be a good thing for the game on balance, though it will change the tactics. Support is not quite as valuable as it was, and the gobs are not as weak as they were.
One concern I have, however, regards battle savvy and creatures. W/o getting into all the probability, each die has around a 5% chance of a critical hit. In the past, it was easy to find unsupported units for a creature to attack, but no longer. If a creature gets into melee, their chance of death is pretty high, IMO.
Now this is currently all just idle speculation on my part.
Are my fears well founded? What's been the actual experience?
Are creatures suddenly much too fragile?
Any insight is welcome.