I will continue to stay firmly in the minority on this one, but I suspect the Suns have not even broached extension talks with Len. Any offer they'd realistically give him would likely poison the well, I'd be surprised if they have even floated the idea of offering him 12 mil per year. Right now he has shown himself to be a borderline rotation player, not a starter and not even a quality backup in the modern 'spread the court' NBA. Yes, there is hope that he can become something more than that but as of now its merely hope. IMO the push to sign Chandler was pretty strong evidence in the lack of faith the organization has in Len developing into a serviceable starter.
Furthermore, I liked Len's 2nd year better than his 3rd. I think he's regressed. 42% shooting is apocalyptic for an interior big, the only number he improved between the two years was rebounding and that increase was marginal. Outside of picking it up a bit on the glass he blocked less, turned the ball over more and shot horrendously.