I talked for quite a while to one of the CM working there just 12 days ago. I asked him if he had heard whether the rumors are true that's its closing. He says "It sure seems likely considering the layout of Toy Story land has the entrance at the half-way point of this building". We then talked about what they were going to do with it, and he again said that really they had no knowledge of what was happening, "Cast Members are usually the last to know", but that they were of course hoping that it would be kept in the parks somewhere, one possible suggestion he made was innoventions - though again he didn't seem to "know" this. He actually said that Walt's Office was NOT shipped to the family museum in SF, but was crated off to somewhere else. (He told me where - but I can't remember what he said - a museum of some sort.) It was nice to talk to a CM that wasn't blowing smoke up my you-know-where.
So anyways, as of August 29th, the CMs had not been informed of it closing.
The other thing to point out is that One Man's Dream wraps around the Voyage of the Little Mermaid - so it seems to me that if they are intending to rip out one, they're likely to rip out the other.