On a side note, I just re-read addrarch 3.11 and I found no text about how a WG deprecates a prefix. As far as I'm concerned, it could mean that all WG members are supposed to telnet to all IPv6 routers in the world and deprecate the prefix there. We need better than this.
The great thing about deprecation is that it doesn't have to happen all at once. We won't reallocate the prefix for some other purpose, just deprecate its use for site-local addressing. So, this won't cause any immediate impact to existing implementations or deployments.
Over time, implementations will cease to provide special handling for FECO::/10 (many don't provide any special handling for this prefix today, BTW) and folks should migrate their deployments away from using site-locals to (one of) the alternatives that we eventually specify (i.e. the bellovin/zill proposal) or that RIRs enact as policy, etc.
Margaret
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