Well, if you check the 'energy' requirements for the new skills, it's either MP, rage, or focus. MP is seen for the Priest primary new skills... whereas both rage and focus are seen in skills from Mage, Rogue, Warrior and Priest. So presumably the 2 'new classes' use rage and focus.
Also, quite a few skills have the term 'rune' in them. I almost want to believe the new classes (or at least 1 of them) are "rune" based, kind of like how the zhuridon seemed to work.
Just thought I'd point these out. Btw, I have been nerd raging so hard since finding these, lol.
I've been doing some research myself, putting together pieces of the puzzle.
Psyron seems to be the one that uses Focus, although not sure. I'd be willing to bet this is a shorter ranged class that primarily is a debuffing or damage dealing class. If I'm right about it using Focus, it probably has some insane burst damage much like Rogues.
Harpsyn one seems to use Rage and temporary buffs/states. I think this is the one that uses the Blood Runes, probably similar to the Druids' Nature Power. I'm still wondering about this class and its primary mechanics, it's hard to tell. R/H seems to have a ton of new traps, including taunting and fearing ones. I'm really looking forward to this one.
I'd love to see a new race, not sure if it is going to be Zurhidon, but we will see. Their story doesn't really lend itself to being friendly to Elfs and Humans. I'm just going to throw it out there, I think the next race will be Naga or Kalonian (Rhino People). The Nagas were kind of forced into slavery by the Zurhidons and didn't have much of a choice. Kalons were friendly with the dwarves but then the whole Sismond story came to ruin everything for them.
Either way, both of these classes and possible races seem like they will fit into the game very well.
Edit: I did some snooping around using the oldest trick in the book...
http://www.runesdatabase.com/skill/498767/
http://www.runesdatabase.com/skill/498777/
http://www.runesdatabase.com/skill/498782/
http://www.runesdatabase.com/skill/498806/
Potential general skills for the new classes I think. :]