Haswell is intels 2013 microarchitecture.
Intel follows a development cycle that they call the "tick tock model". When they release a major microarchitecture revision it is called a "tock". The next year they will then do a die shrink of that microarchitecture and make a few minor changes, this is called a "tick". This will then be followed by a tock, then a tick, then a tock, and so on and so on. Ivy bridge is a tick, a die shrink of sandy bridge, haswell will be a tock, a major revision of the microarchitecture. Why is this important? Because ticks usually show very little improvement to performance since they are mostly just a die shrink while tocks usually make huge improvements in performance due to major improvement to the microarchitecture. Basically you usually want to wait for the next tock if you're interested in maximum performance.
Usually not much is known about new microarchitectures until about a month or two before its release so we still don't know very much about what improvement haswell will bring.
And as usual wikipedia has the best chart to illustrate the point: http://en.wikipedia.org/wiki/Intel_Tick-Tock
Intel follows a development cycle that they call the "tick tock model". When they release a major microarchitecture revision it is called a "tock". The next year they will then do a die shrink of that microarchitecture and make a few minor changes, this is called a "tick". This will then be followed by a tock, then a tick, then a tock, and so on and so on. Ivy bridge is a tick, a die shrink of sandy bridge, haswell will be a tock, a major revision of the microarchitecture. Why is this important? Because ticks usually show very little improvement to performance since they are mostly just a die shrink while tocks usually make huge improvements in performance due to major improvement to the microarchitecture. Basically you usually want to wait for the next tock if you're interested in maximum performance.
Usually not much is known about new microarchitectures until about a month or two before its release so we still don't know very much about what improvement haswell will bring.
And as usual wikipedia has the best chart to illustrate the point: http://en.wikipedia.org/wiki/Intel_Tick-Tock
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-Ron Swanson
"I shall be a good politician, even if it kills me. Or if it kills anyone else for that matter. "
-Mark Antony