FUD Zilla writes the Q43 and Q45 IGP chipsets from Intel will be pushed back until the end of June at the earliest.
Currently, Intel's partners are using an updated A2 revision of the 4-series, but the final A3 version should be out in the middle of May if all goes to plan. This means that the P45 chipset is slightly behind schedule, as motherboard manufacturers were planning to have boards in the channel in May.
The other affected chipsets are the P43, G45 and G43, although the G-series was always planned to be launched slightly later than the P45 and P43. Production of motherboards should start at the end of May, so we might not even get to see final boards during Computex, but they should be close to the final product.