Update 23/Apr/2014; SP1 has been re-released; http://blogs.technet.com/b/stefan_gossner/archive/2014/04/22/sp1-for-sharepoint-2013-has-been-rereleased.aspx

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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.

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For all our Office Server 2013 products we can offer now the first service pack SP1.

Updated 03/Mar/2014

In case you have a SharePoint Foundation 2013 Server, you need only the SP1 for Foundation and of course language packs for Foundation SP1.

For our full SharePoint 2013 Server you only need the SharePoint Server SP1 package. There is no need to install Foundation SP1 because it is included in the Full Server SP1. Same is valid for the additional SP1 language packs you may need when having at least one additional LP installed.

For Project Server 2013 you need the SharePoint Server 2013 SP1 and LP SP1 packages and the Project SP1.

Our KB articles for your reference:

  • KB 2880551 - SharePoint Foundation 2013 SP1
  • KB 2880555 - SharePoint Foundation 2013 Language Packs SP1
  • KB 2880552 - SharePoint Server 2013 SP1
  • KB 2880554 - SharePoint Server 2013 Language Packs SP1
  • KB 2880553 - Project Server 2013 SP1
  • KB 2880558 - Office Web Apps Server 2013 SP1

Service Pack 1 also includes a rollup of all Cumulative Updates through December 2013, and all Public Updates through January 2014.

When our next April 2014 CU will be available it can be installed on top of SP1.

Download links for SP1:

Good references to know:

Issues Fixed by Service Pack 1 (SP1) in Office and SharePoint 2013 

Software updates overview for SharePoint 2013 great articles to plan and test all the steps you need to know until your production is on the latest bits.

Office Sustained Engineering Blog more about SP1

FAQ about SP1 please check the post from my colleague http://blogs.technet.com/b/stefan_gossner/archive/2014/02/27/sp2013-sp1-faq.aspx

Slipstream version of SharePoint 2013 including SP1 please also check the post from my colleague SharePoint 2013 with SP1 ( slipstream ) is now available for download

Thanks to my commentators for the hints/questions.