All critical flaws being addressed carry the risk of remote code execution, including the Windows Server Message Block (SMB) network and file-sharing protocol that was disclosed in February. From the important bulletins, six of them address remote code execution issues, one deals with privilege escalation, and the last one fixes a security flaw that can lead to information disclosure.
All versions of Windows are affected by this batch of updates and seven of the bulletins have mandatory restarts, so it looks like system administrators will have their hands full deploying April's batch of patches. Not included in the list of patched software is Internet Explorer 9; apparently this latest version of Microsoft's browser immune to the flaws being patched. You can read the monthly advance notification detailing the affected software here.