It looks like there were some leaks in the recent days as one guy has received an Engineering Sample Ivy Bridge CPU to benchmark, here are the specs:
Name: Ivy Bridge 22nm Quad Core
Model: QBB1 ES
Speed: 2.00 GHZ, 2407.1MHz with Turbo Mode
TDP: 65W, 1,056V
L3 Cache: 6MB
Ivy Bridge Benchmarks
While running AIDA64 benchmark, Ivy Bridge Quad Core has achieved 16 GB/s memory read and 13 GB/S memory write numbers.