The SKUs based on 18-core Haswell-EP die are already announced by intel.
E5-2699v3, 2698v3, 2697v3, 2695v3, 2683v3.
From some leaked threads: 2699v3 18-core; 2698v3 16-core; 2697v3, 2695v3, 2683v3...
The rumor from vrzone seems unreliable. It mentions that Haswell-EP has "three main die flavours 10-core, 14-core and 18-core".
According to recent docs from intel, the 3 flavours of Haswell-EP dies are 8, 12 and 18 core.