The latest Window 8 preview is for download from 31st May.
Window 8 is the code name for the upcoming version of Microsoft Windows, that will follow its ancestor Window 7 with a Bold looks. Window Developer preview is available from November but the new preview is available from June.We don't when Window 8 will release till then you can enjoy Window 8 preview its free.
Download Link Is given Below:-
From this you can enjoy Window 8 Developer Preview.