1. What God weapons are there now?
2. What god scrolls are there now?
3. Since battle scores are cleared - did item drops get updated?

All depends on how long you've been gone for...

Off the top of my head the only new 'Godly' is:

Cronus Blade

Which is a magma Godly.

There's only been 1 Demigod scroll released and a Semi-Demi God scroll.

Skelly Scroll Demigod scroll

Aftershocks Scroll Semi-demi Godly scroll

All challengers have been reset because of EXP changes but no loot has been changed just the way EXP is awarded. (Smallest amount at win 1 and largest amount at win 10.)