My DS is 6 and has a similar spread. I think verbal is 114 and perceptual reasoning was 141. From the research I did sometimes this suggests autism, but we were able to rule it out in DS's case. What subtests were done for verbal, and what were the scores? That might give you a clue.
DS was a late talker and when he was tested at 3.5 he had a similar gap between verbal and non-verbal. Now both scores are just shifted upwards about 20 points from 3 years ago. He has dyspraxia/developmental coordination disorder so verbal expression is difficult for him--both the motor output and forming comprehensible sentences, I think. I don't think a gap necessarily indicates a disorder, but sometimes it does. Your ds may be dyslexic, but I don't really think that explains the gap on the WISC. On the WISC, it is more along the lines of defining vocabulary words, asking verbal reasoning questions, like having the child explain why people turn off light switches, or asking how two words are similar. One thing you could ask about is testing for a language disorder.
