http://www.cpu-world.com/news_2012/2...confirmed.html
TL;DR:
April 8:
Z77, Z75, H77 and B75 chipsets.
April 29:
i5- 3450, 3550, 3550S, 3570K, 3570T
i7- 3770, 3770K, 3770S, 3770T
(mobile) i7- 3720QM, 3820QM, 3920XM
June 3:
i5- 3470, 3470D, 3470T, 3475S
(mobile) i5- 3320M, 3360M, 3427U
(mobile) i7- 3520M, 3667U
Q3:
i3- 3220, 3220T, 3225, 3240, 3240T
(mobile) i3- 3217U