The next cumulative update is available. It is still highly recommended to install SP1 before you install post SP1 updates.

KB articles are having sometimes a bit delay but the download of the fixes are possible.

MSF2010:
2597132 The full server package for Microsoft SharePoint Foundation 2010
http://support.microsoft.com/default.aspx?scid=kb;EN-US;2597132

Download link: http://support.microsoft.com/hotfix/KBHotfix.aspx?kbnum=2597132&kbln=en-us

SPS2010:
2597150 The full server package for SharePoint Server 2010 and contains also the MSF2010 fixes so you need only this one package.
http://support.microsoft.com/default.aspx?scid=kb;EN-US;2597150

Download link: http://support.microsoft.com/hotfix/KBHotfix.aspx?kbnum=2597150&kbln=en-us

Important for all Server Applications listed above:
After applying the preceding updates, run the SharePoint Products and Technologies Configuration Wizard or “psconfig –cmd upgrade –inplace b2b -wait” in command line. This needs to be done on all servers in the farm with SharePoint installed. You can run psconfig in parallel on all SharePoint machines.

SP1 references:

My post for June CU and SP1:
http://blogs.msdn.com/b/joerg_sinemus/archive/2011/06/29/sharepoint-2010-sp1-and-post-sp1-june-2011-cu.aspx

Post made by my colleague regarding a rerelease of June CU:
http://blogs.technet.com/b/stefan_gossner/archive/2011/07/12/june-2011-cu-for-sharepoint-2010-has-been-re-released.aspx

Posts by CAPES:
SharePoint 2010 SP1 and the June Cumulative Update for SharePoint 2010

Office 2010 Service Pack 1 - 5 Common questions regarding the Service Pack