..Hard Mode?

please explain to me what this is.

We don't know for certain. Wait a few more days.

It is a feature in development
http://wiki.guildwars.com/wiki/Hard_mode
http://gw.gamewikis.org/wiki/Hard_mode
It, in a very simple way, is PvE but harder

Let me guess ... more ridiculous level28 mobs that either spike you so fast you couldn't do anything or still **** because they have trash builds and no healer(s).

/pass. just give us another Sorrow's Furnace-like update and ill be happy.

We'll know when ANet releases it, which should be soon.