Greetings Raj,
As Mom to a five year old princess, I totally understand where you're coming from! To put it simply, both Doc and Sofia rock the house, in my opinion, and I couldn't be happier to hear that they have joined the colorful cast of Disney Junior - Live on Stage! at Hollywood Studios.
Not sure when you're planning to visit, but as of today, no announcement has been made as to when or if these leading ladies will be making appearances in the parks. I can remember when Jake the Neverland Pirate made his stage show debut and I seem recall that it took several months for him to actually beginning greeting guests in the park.
With the increasing popularity of both Doc McStuffins and Sofia the First, I would definitely be willing to bet that there in-park debuts lie in the near future, but unfortunately, I just can't say when that will happen! I suggest keeping an eye on the official
Disney Parks Blog for any updates. This, in my opinion, is the number one source for Disney news as it unfolds!
Best Wishes,
Amanda F.