Microsoft has announced Microsoft Office 2013 Customer Preview and also announcing that the Office 2013 preview is available for download.
Computer and processor: 1 Ghz or greater x86/x64 Processor with SSE2 instruction set
Memory: 1 GB RAM (32 Bit) /2 GB RAM (64 Bit)
Hard disk: 3.5 GB free disk space
Operating System: Windows 7 or newer, either 32-bit or 64-bit; Windows 2008R2 or newer with .Net 3.5 or greater.
Graphics: Graphics hardware acceleration requires DirectX10 graphics card and 1024 x 576 resolution
Note :To use with Windows 8 you must be running the Release Preview version or higher.