I wondered that too. But in the news section[1] of the front page:

The winning source will be released later this year after the winners have reviewed the writeup of their entries.

[1]: http://www.ioccc.org/index.html#news

The whole fun of the ioccc is to go through the code and figure out how it is done. Without the code this is a non-event.

Reading the write-up in combination with the code is usually really entertaining. Having the code before that would make it a lot less entertaining. But you are of course right, as long as there is no code, there isn't much to actually see here.

"writeup"? Ouch! Ah, it's the The International Obfuscated C Code Contest.