I got lucky, and hit 2 soft openings - 1 by chance, and 1 on purpose. Couple of years ago, Mission Space was going to open several months later, but my friend told me that sometimes they "pre" open as he called it back then. Sure enough, we walked by, and they were taking people. It was so new, you could just walk on. First time I ever saw someone throw up after a ride!
This past spring, I was in town for just the day, and went over to Disney (risking the parking fee), and just walked to the ticket window and asked if Soarin was in soft opening that day. The ticket person (CM) said that she can't guarantee it, but if the ride was not down, they would be letting people ride it. Once again, no line, walked in, and just had to wait in the normal "queue", while the previous group rode it.
I am hopeful that EE will be in pre-soft-opening in the first week of March. If they plan a spring opening, March would be the dates for the first group of soft openings. (imho)