Galacticraft has gained a lot of new content in 1.6, such as Mars. They've also added solar panels, a more powerful rocket required to reach Mars, and space food, but it's not a game changer. Servers already say [1.1.10] in the title, no reason why they can't say [2.0.0].
You realize that it's not up to CanVox if the power system changes? And why are you upset that tekkit is more complicated? That's the whole point of Tekkit.