There is no doubt core for core and clock for clock haswell will be faster but it won't have as many cores, which has always been the main benefit of the 2011s.
Or PCI EX lanes.
The user above says clock for clock SB-E and SB are identical they are not. WIth a gen 3 card the SB-E is faster. Also SB-E has a far stronger memory controller to SB with SB-E being able in some cases to do 2600, SB stuck around 2200.
They will phase out the 3960 and 70 for sure when the 80 arrives. IB- E looks great to me.