Download Language Interface Packs for 32-bit (x86) Windows 7 Beta

Note: String in bracket is CRC value.

US English: x86fre_client_en-us-GB1CLP_EN_DVD.iso (0×7E8005D4)
Simplified Chinese: x86fre_client_zh-cn-GB1CLP_CN_DVD.iso (0xC8A91CD0)
Traditional Chinese: x86fre_client_zh-tw-GB1CLP_TW_DVD.iso (0×79D97687)
Korean: x86fre_client_ko-kr-GB1CLP_KO_DVD.iso (0xBBCABDAE)
Arabic: x86fre_client_ar-sa-GB1CLP_AR_DVD.iso (0xA95E7173)
German: x86fre_client_de-de-GB1CLP_DE_DVD.iso (0xB8B06076)
Japanese: x86fre_client_ja-jp-GB1CLP_JA_DVD.iso (0×6D8F6779)
Hindi: x86fre_client_LIP_hi-in-GB1CLIP_HI_DVD.iso (0×53974B35)

Download Language Interface Packs for 64-bit (x64) Windows 7 Beta

US English: amd64fre_client_en-us-GB1CxLP_EN_DVD.iso (0×52E672BD)
Simplified Chinese: amd64fre_client_zh-cn-GB1CxLP_CN_DVD.iso (0×99B92D93)
Traditional Chinese: amd64fre_client_zh-tw-GB1CxLP_TW_DVD.iso (0×0A580CAE)
Korean: amd64fre_client_ko-kr-GB1CxLP_KO_DVD.iso (0×2327DCFE)
Arabic: amd64fre_client_ar-sa-GB1CxLP_AR_DVD.iso (0×67ED3E9F)
German: amd64fre_client_de-de-GB1CxLP_DE_DVD.iso (0×29744B81)
Japanese: amd64fre_client_ja-jp-GB1CxLP_JA_DVD.iso (0×78B0F90B)

Download Local Language Interface Packs for Windows 7 Beta

The ISO appears to have LIP display language packs for Australia, Brazil, Canada, China, Germany, Spain, France, UK, India, Italy, Japan, Korea, Mexico, Netherlands, Poland, Russia, Turkey, Taiwan, US, and South Africa.

32-bit: client_localpacks-GB1LCLPCKCFRE_DVD.iso (0xFCB14E84)
64-bit: client_localpacks-GB1LCLPCKCXFRE_DVD.iso (0×21195B94)

Download Language Interface Packs for 64-bit (x64) Windows Server 2008 R2 (Windows 7 Server) Beta

English: amd64fre_Server_en-us-GB1SxLP_EN_DVD.iso (0×6D5C14B9)
German: amd64fre_Server_de-de-GB1SxLP_DE_DVD.iso (0×5ABA32E3)
Japanese: amd64fre_Server_ja-jp-GB1SxLP_JA_DVD.iso (0xB26F02D7)
Arabic: amd64fre_Server_ar-sa-GB1SxLP_AR_DVD.iso (0×79466856)

Download Language Interface Packs for 64-bit (x64) Windows Server 2008 R2 (Windows 7 Server) Beta Itanium Systems

English: ia64fre_Server_en-us-GB1SIALP_EN_DVD.iso (0xE226D219)
German: ia64fre_Server_de-de-GB1SIALP_DE_DVD.iso (0×7706D664)
Japanese: ia64fre_Server_ja-jp-GB1SIALP_JA_DVD.iso (0xFDBADFAC)

The step to install additional display language in Windows 7 is pretty much the same with Windows Vista. Check out the tutorial to install additional display languages (MUI and LIP) and change the display language.