This new beta update features some of the new changes and additions for the next 1.7.2 regular update which will mainly include a new GPU mode and several performance improvements.
Current changelog:
Added obj file export feature (Found in the "Fun Tab" in the Tools Menu)
Added GPU button to enable GPU physics (currently work in progress)
Optimized quadtree creation process for the gravity simulation
Optimized quadtree traversal for the gravity simulation
Improved gravity simulation quality while also improving performance (densely packed regions like stars don't drift away anymore
Set softening minimum slider value to 0.5
Changed slider "Max Color Force" to "Max Force Color"
Known issues:
Currently GPU simulation doesn't have a massive impact in performance. I'm trying to work on this
GPU currently doesn't support fluids
GPU currently doesn't support constraints
GPU currently doesn't support correct temperature simulation