kitsune9
Adventurer
I'm sure the check system will be a turnaround "roll-under-ability-score" type, i.e. d20 + score + modifiers vs. 15 (easy)/20 (default)/25 (hard)/etc., as has been pointed out by many.
I'm also sure that skill customization isn't done after character creation. Advancement will be expressed through rising skill modifiers (and maybe also through increasing ability scores), and not just by picking new skills.
I hope there will be an implementation of the crafts rank system Monte mentioned in L&L: novice, apprentice, journeyman, master, (possible) grandmaster. Each set apart by a +5. So instead having a clusterof modifiers, you'd have a small number of possible values.
In fact, I'd like to see a "roll under ability" option that does away completely with numerical DCs: Every task would have a difficulty named after the necessary rank to do an unmodified check, like climbing (master). If you're one rank below that, you roll at a -5 penalty, if you're one rank above, you get a +5 bonus (or even succeed automatically).
You could be onto something there Tilenas. A roll under ability check would an interesting mechanic instead of set DCs.