I have downloaded yesterday IDEA 4.0 release and installed it. I have noticed that the build number was #1162 for Windows & MacOSX.
Today I have redownloaded it and the build number is now #1165!
This is somewhat strange, confusing and seems like the IDEA release team is delivering builds with the same name (IDEA 4.0 release) but with different build numbers and thus probably bug fixes.
Please note that it is a good point that IDEA team is responsive on killing bugs but be serious with the process! If build #1162 is the 4.0 release, then build #1165 SHOULD not be 4.0 but be 4.0.1 or anything else.
I remember to have noticed this problem in the past 3.0.X build, IMHO this is a bad release process that just can lead to FUD about IDEA versions.
Fabrice DI MEGLIO