Without any doubt it is due to the recent disclosed security exploits as well as the leaking of several Haswell overclocking results, that CPUID has decided to drop validation support for CPU-Z versions V1.62 and V1.63. The latest CPU-Z version, V1.64, is now the only supported version. V1.64 should offer better security and an even more improved version should be available soon.
Concerning the series of leaked Haswell overclocking results, including the 7GHz Core i7 4770K validation, rumors state that the validations made with V1.62 cannot be trusted and should be considered a bug. In addition, the 8GHz Core i7 4770K that featured on a YouTube video is simply fake. In conclusion, apart from the 6.2GHz validation screenshot, it seems that we are still waiting for the real overclocking results of the upcoming Haswell micro-architecture. Many samples are floating around, so we can probably expect more leaks in the near future.
HWBOT forum thread: http://forum.hwbot.org/showthread.php?t=74940.
Download V1.64: http://www.cpuid.com/softwares/cpu-z/versions-history.html.