OK,
I can tell you about the current games (don't know enough about the ones that aren't out yet)
Frostgrave/GA -
Approximately 10 minis per side - A leader, a second, up to 4 specialists, and the rest standard fodder, er, crew.
Two different books/setting - Frozen cities being revealed after 100s of years and a series of islands that surface after 100s of years
Exploration-driven as opposed to just head to head clash, nice scenarios and campaign rules
Gaslands
Kit bash hot wheels with weapons! Need I say more?
Also, this from the rulebook:
"In Gaslands, if the rules are unclear, choose whichever option results in the most carnage for all concerned. This is The Rule of Carnage"