I do, a human getting a bonus to all scores sounds good to me (like angular banjos).
Do we know if these bonuses are +1 or +2?
Would a human gain +1 to all scores, and an additional +1 to one of his/her choice?
Does a high elf get +1 or +2 to Int?
Do classes also grant a bonus?
High elf gets +1 to INT.
The pre-gen characters were all reverse engineered and it was figured out what the races/classes got for bonus ability scores. Every character started with the Elite array-- 15, 14, 13, 12, 10, 8... and then added:
Fighter +1 STR
Cleric +1 WIS
Rogue +1 DEX
Wizard +1 INT
Mountain Dwarf +1 STR
Hill Dwarf +1 CON
High Elf +1 INT
Lightfoot Halfling +1 DEX
Human +1 to all six scores and additional +1 to a score of their choice.
I would not be surprised if the Wood Elf gets a +1 to DEX, Half-Elf gets a +1 to CHA, and Stout Halfling gets a +1 to CON.
As far as the human bonuses... I think the extra +1s across the board in place of any actual racial abilities actually works well. It's easy, it's simple, and after application you get bonuses to some skills and saves, because some of your modifiers will go up a point as a result.