There are new rendering extensions supported in SSRS 2012. Welcome extensions are the OPENXML rendering formats, to be used with Word 2007/2010 (.docx) and Excel 2007/2010 (.xlsx).

To list the rendering extensions, you can use the ReportViewer from the Reporting Services Redistributable Package.
You can download from here
http://www.microsoft.com/en-us/download/details.aspx?id=6442

 
[System.Reflection.Assembly]::Load("Microsoft.ReportViewer.WinForms, Version=11.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91") | Out-Null
 
$ReportServer = "http://KERRIGAN:80/ReportServer"
$rv = New-Object Microsoft.Reporting.WinForms.ReportViewer
$rv.ProcessingMode = "Remote"
$rv.ServerReport.ReportServerUrl = $ReportServer
$rv.ServerReport.ListRenderingExtensions()

This should list all the currently supported extensions. In SSRS 2012 they are listed below. Note that both Word 2003 and Excel 2003 are technically still supported, but by default they are hidden from the export dropdown. The Excel and Word that we see in the export dropdown is the EXCELOPENXML and WORDOPENXML formats, which corresponds to the new .xlsx and .docx extensions.

Name LocalizedName Visible
XML XML file with report data True
NULL NullRenderer False
CSV CSV (comma delimited) True
ATOM Data Feed False
PDF PDF True
RGDI Remote GDI+ file False
HTML4.0
MHTML MHTML (web archive) True
EXCEL Excel 2003 False
EXCELOPENXML Excel True
RPL RPL Renderer True
IMAGE TIFF File True
WORD Word 2003 False
WORDOPENXML Word True
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