Intel is going to start a massive program to clear the current stock of haswell based processors. In the second quarter, Intel will release the new Core i5 4310M, i5 4340M, i7 4610M, i7 4810MQ, i7 4910MQ and 4940MX. We do not expect performance difference between these upcoming and current models to be massive.
So let us say, an Intel Core i5 4340M is going to deliver same performance as the Core i5 4330M and in real world you would not notice any performance difference unless you are using a benchmark app.
Intel will be increasing the clock and turbo boost speed of Core i5 4310M, i5 4340M, i7 4610M, i7 4810MQ, i7 4910MQ and 4940MX. TDPs of all will not be changed.