The major checkpoint-related improvement is that stealth detection no longer automatically desynchronizes the player during the revamped tailing and eavesdropping missions.
The checkpoint and Turning Points systems are strongly supported, letting players jump back, rewind decisions, revisit key points, or retry outcomes. Nearly every relevant preview treats this as a major feature.
Checkpoint support is mixed. One review notes the ability to reload the final checkpoint, but other save-related evidence points to limited manual control.