Unearthed Arcana provides a new possibility of granting experience: Three-Pillars Experience
This system is based on tiers (see page 2 1st paragraph). The only part I can find any explanation of tiers in 5e is in the DMG.
- Tier 1: 1-4
- Tier 2: 5-10
- Tier 3: 11-16
- Tier 4: 17-20
Are these the tiers used in the new experience system?