Update 03/Apr/2014

You will read in kb article 2817429 and 2817439

Notice
We have recently uncovered an issue with this Service Pack 1 package that may prevent customers who have Service Pack 1 from deploying future public or cumulative updates. As a precautionary measure, we have deactivated the download page until a new package is published.

As soon we have more information, we will update you.

##########################################

With the KB article 2817439 you may saw an important notice regarding the search webpart. Now we have a hotfix to fix that issue we called March 2014 PU (public update).

KB 2760625 - March 2014 PU for SharePoint Foundation 2013

Download SharePoint Foundation 2013 March 2014 PU

Steps to install SharePoint Foundation 2013 SP1 and this fix:
You can install this fix either before or after installing SP1. No specific sequence required.
PSConfig only has to be run once at the very end after installing the fixes and SP1.

Check also the post from my colleague Stefan.

There is no action necessary in case you have SharePoint Server 2013.