On Tuesday, April 9, 2013, Microsoft is planning to release nine (9) bulletins. Two bulletins are identified as Critical with seven bulletins rated Important.
The critical bulletins will address vulnerabilities in Microsoft Windows and Internet Explorer. The bulletins rated Important and will address issues in Microsoft Windows, Office, Antimalware Software, and Server Software.
I don't recall previously seeing a security bulletin for Antimalware Software. The Advance Notice indicates that the Important update is for Windows Defender for Windows 8 and Windows RT.
As happens each month, Microsoft will also release an updated version of the Microsoft Windows Malicious Software Removal Tool on Windows Update, Microsoft Update, Windows Server Update Services, and the Download Center.
- MSRC Blog: Advance Notification Service for April 2013 Security Bulletin Release
- TechNet: Microsoft Security Bulletin Advance Notification for April 2013