Here's a new article from http://www.digitalspy.com/gaming/feature/a662298/expect-lots-of-guns-exploding-heads-and-perks-to-play-with-in-fallout-4.html#~pkHScECjCpKLUd Edit: Be warned- Quite a few new spoilers.
Quickly describes perks: Each of the game's seven attributes (SPECIAL) have ten perks each, giving a total of 70 to unlock and use. Since there are also multiple levels of each perk you will have a total of 275 to choose from.