It's still WAY too soon to judge M:S future wait times.
With 3 centrifuges running, Single Rider Line, and NO FastPass, it takes about 20 minutes to wind through the entire INDOOR queue.
Add another 10-25 minutes for the OUTDOOR queue (which begins in the covered entryway and winds along the north side of the building near Test Track)
We still don't know the effects of:
*FastPass
*The 4th Centrifuge
*The largest onslaught of Disney advertising we've probably ever seen
Theoretically, the 4th centrifuge will speed up guest throughput by 25%. But if they "dedicate" that 4th centrifuge to only FastPass riders, we're back to the wait times I described above. (If they "dedicate" 2 centrifuges to FastPass, the above "standby" wait time obviously increases)
Keep in mind that with FastPass, the physical size of the queue has nothing to do with the wait time. On Test Track--- the length of the "standby" queue is quite short--not alot of switchbacks-- but you stand in one place for a long time)
With absolutely NO public advertising and NO mention of M:S in park guidebooks--- and under the conditions outlined above-- the M:S wait has been about 30-40 minutes. But when Disney starts running NATIONAL TV ADS promoting Mission:Space, you can guarantee people are going to be flocking to ride it.
My recommendation: Like all popular E-ticket attractions, GET YOUR FASTPASS EARLY!!!!!!