Something that most MMOs are missing out on is a very integrated lore system that doesn't just feel like a bunch of pasted in text. I remember playing CoH many years ago, and when clicking on the info button on an enemies portrait I was surprised by the little bit of info on that mob's race and significance in the game.
Now that is a pretty basic game in retrospect, especially when you have single-player RPGs to take inspiration from.
The Witcher for an example, has a wonderful bestiary that not only gives a detailed description of mobs, but also reveals their strengths/weaknesses, and what items are dropped from them. For those not familiar with the game, you can learn about mobs either by putting your skill points towards a skill that gives you the info, or by buying scrolls/books that teaches you what you need to know about the monster.
Something similar to that would be pretty amazing in PO, where some players would automatically be able to identify beasts thanks to various selected feats/abilities, others could purchase tomes/books/scrolls that have been inscribed by the former players in order to learn detailed information about the monster.