I have not seen a definitive answer other than what they set for the final development phase, which is two. This could change with release.
were did yah hear this? last time i saw them mention it in an interview they said it was 3 but were going to listen to fan feedback before they decide for sure.
in truth i like every level this allowed me to get most of the "good perks for a character"
I say this because you really couldn't do a no combat character and nearly all the noncombat perks were useless except for opening up one or 2 speech options with characters, who you may not even be able to select them with by the time you obtain the perk. aka gun nut added a speech option with the weapon shop guys in rivet city.