Heroes III is, at its heart, a PlayMesh title that follows the PlayMesh model. This means that it forces you to buy Heroes III Alliance Members, all areas of Quests and Properties are inter-related, and fighting other Heroes III players is an important aspect. What Heroes III brings new is the same thing that the others brought new, which is based largely around an enhanced and centralized interface.
The Heroes III Hospital and Heroes III Vault are both under the banner of Heroes III Services. The Daily Unlock is a fun feature that sends you on a scavenger hunt for a reward of speciality items. This is common to all third generation PlayMesh text based iPhone RPGs, which keeps it in line.