I'm old school, I started at 2nd edition and found most of the newer editions unbearable. Never tried 3.5, just skipped to 4.0 from there. Skipped 5.0 entirely and just went ahead with Shadowrun instead.
added a Panic gauge to battle. it fills up according to your actions. each character has a different passive that activates once the gauge is full. also once full, a countdown starts and after each action taken, the gauges decreases. with each character, the decrease is different.
Prototyping some overworld abilities. Some of the characters you'll meet on your journey can use special overworld skills to travel around. This can be something like digging holes in the ground or getting hints towards your next objective.