Like in 1.4.4-1.4.7 My minecraft hosts to LAN at 0.0.0.0:port, don't close this as a duplicate of MC-2583 because that is labeled as fixed, as where i am still having problems.
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Please do not mark unreleased versions as affected. You do not have access to this yet.

Did you open your firewall for Minecraft (java.exe / javaw.exe) ?
It has affected all the snapshots for 1.6 and only 3 where available.
LAN issues are technical support issues (Firewall, port forwarding etc.). For technical support please use the Mojang Support Center.