It's hard to ignore the parallels with Walt here - a true creative visionary and futurist, whose impact on the world within and even beyond his field can hardly be overstated, taken too early by a devastating disease. The world will forever be robbed of what Steve could have done next.
Some reactions on twitter from within the Disney community:
Toy Story 3 director Lee Unkrich
Imagineer Alex Wright
Imagineer Jason Grandt (one, two, three)