Hello Mishalae,
Welcome to the Disney Parks Moms Panel! I hope you are having an Interstellar day!
Our son loves Miles from Tomorrowland too, so I completely understand your 3 year old son being on a mission wanting to meet him when he is actually at The Happiest Place on Earth. Right now there is no update from our friends at the Disney Parks Blog whether Miles from Tomorrowland will be landing in the Disneyland Resort. Be sure to keep an eye on the
Disney Parks Blog if any messages from Outer Space arrive regarding Miles from Tomorrowland.
You could surprise your little explorer with one of these
blast-tactic items from the Disney Store for his birthday in June and give it to him when you arrive at the Disneyland Resort.
I hope this helps. If you have any more questions, please visit me here and let me know how I can help you plan your magical vacation.
Wishing you a Super-stellar time at the Disneyland Resort!
~ Lynette