Hardware Requirement

Web and App server or Single Server Farm.

Processor: 64 bit, 4 cores
Ram: 8 GB for production use. 4 GB for developer or evaluation use (same as SharePoint 2010 =))
Hard Disk: 80 GB free for system drive. Maintain 2x free space as available RAM.

Database Server

Processor: 64 bit, 4 cores for Small deployments. 8 cores for Medium deployment
Ram: 8 GB for Small, 16 GB for Medium
Hard Disk: 80 GB. But this depends on how your environment.

Software Requirement

Web and App server

64 bit edition of Windows Server 2008 R2 Service Pack 1 (SP1) Standard, Enterprise, Data Center or Web Server

.NET Framework version 4.0

Database Server

64 bit edition of Microsoft SQL Server 2008 R2 Service Pack 1
64 bit edition of Windows Server 2008 R2 Service Pack 1 (SP1) Standard, Enterprise, Data Center or Web Server

2005 SQL Server, 2008 SQL Server is not supported!!!

Windows 2008 is also Not SUPPORTED!!!

If you wish to go SQL Server 2012, use RTM version.

Browser Compatibility

As usual, Google Chrome, FireFOX and others are supported WITH LIMITATION. (not clear)

IE 7 is not tested. IE8 IE9 in 32 Bits is good to go