You mean the client or addon-writing interface? If it's the interface I could somewhat understand, though delaying the interace development would be a mistake. If you want to forbid the possibility of writing addons before the client is released then you are making a huge mistake in my opinion.
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Hoho... you made absolutely no sense.
You can still write and upload addons to WoWI, Curse, etc before this is released.
EDIT: Or do you mean plugins to the client?