You will still have access to your old characters when Cataclsym hits in December of 2010. They will not be deleted or anything like that.
Yes, Mount Hyjal will be accessible in Cataclysm when it hits the stores. It will be for high level characters to level in. There will also be an instance located there.
Nordrassil is located in the Mount Hyjal zone, or will be when the Cataclysm expansion hits.
When World of Warcraft: Cataclysm hits the shelves and goes live on the servers, it will be the LATEST expansion. There are more planned, however Blizzard has not released any information about those expansion as of yet. It will be sometime before the next one is ready.
Currently (in Wrath of the Lich King), it is Thrall. When Cataclysm hits the stores, Garosh Hellscream will become the leader of the Horde.
It will be released in a patch a little before Cataclysm hits. It is currently on the PTR (Test Realm), but blizzard has said it will not be activated live until right before Cataclysm hits, and it will not be a permanent thing either. It will disappear either when cat hits, or shortly thereafter.
After it hits, it comes to a standstill.
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