This is the one we've been waiting for.
This is a legit leak from the Russian badasses at WZT
In this one:
Unmodified Windows 8.1 Core/Pro x86 32-bit
After installing you can change key to your legit 8.0 key.
Alternatively you can enter the 8.1 gVLK, but know that you cannot
activate it yet as it requires KMS v6 protocol and the current activators
only use KMS v5 protocol. You will need to wait for an activator dev to reverse
the protocol like they did on v5
I think that you might have to use the default key for upgrading, then change it later.
RELEASE DATE: 08/21/2013
SIZE: 2,915,131,392 byte
Here are the language packs (36in1) for Windows 8.1 RTM from the Leak-Master WZT
Now you can change language in control panel and point it at the cab file for your particular language.
SIZE: 1,483,513,856 byte
LANGUAGE PACK (Multiple Languages) - the packages for localizations of the interface of the user Microsoft Windows 8.1 Contain 36 languages.
The following 36 languages are included: Arabic, Bulgarian, Chinese-Hong Kong SAR, Chinese-Simplified, Croatian, Czech, Danish, Dutch, English, Estonian, Finnish, French, German, Greek, Hebrew, Hungarian, Italian, Japanese, Korean, Kyrgyz, Latvian, Lithuanian, Norwegian, Polish, Portuguese-Brazil, Portuguese-Portugal, Romanian, Russian, Serbian, Slovak, Slovenian, Spanish, Swedish, Thai, Turkish, and Ukrainian.