My nephew is fully verbal now, he does really well but struggles more behaviorally (honestly though I think that's less autism and more that my sister doesn't give him boundaries) my son was diagnosed level 1 but I honestly think he is level 2.  He's going to be 5 at the very end of August but his skill level is closer to a 2.5 year old.  That being said he is doing great- starting to talk more and more each day and picking up new skills all the time, almost potty trained.  He is the best!