Microsoft released the public beta for SharePoint 2013.
Download SharePoint 2013 Foundation here:
http://www.microsoft.com/en-us/download/details.aspx?id=30345
Download SharePoint Server 2013 here:
http://technet.microsoft.com/en-US/evalcenter/hh973397.aspx?wt.mc_id=TEC_121_1_33
Here’s a bunch of other SharePoint 2013 content
http://www.microsoft.com/en-us/download/search.aspx?q=SharePoint%202013&p=1&r=40&t=32
…including:
- Microsoft Office Web Apps Server Preview
- SharePoint Designer 2013
- Duet™ Enterprise for Microsoft SharePoint 2013 and SAP
- Language packs
- Architecture documents
- Lab guides
Enjoy!