No specific reference but here is what Macworld said:
Microsoft’s Excel 2011 team has also worked to make Mac macros compatible with those written for Excel for Windows. According to Microsoft, Excel 2011 for Mac features a full port of the Windows Office VBA environment; in most cases, the OS X and Windows versions of VBA now mirror each other. This includes updating the core VBA engine in Office 2011 to VBA version 6.5, and adding some commands (FormatCurrency, FormatNumber, Replace) that had been disabled in Excel 2004 for the Mac. When there were object-model differences between the Windows and OS X versions, Microsoft says it conformed the Mac version to Office 2010. (Macworld hasn’t had the opportunity to fully test that Windows-compatibility yet.)
Like I stated before, you need to tune up your VBA skills, however, most of your macros should only need minor work and to be recompiled.