Yes, that's correct, Microsoft Dynamics GP 2013 R2 is now available for download from PartnerSource and CustomerSource.
The core Dynamics dictionary version for GP 2013 R2 is 12.00.1745 and the Dexterity version is 12.00.0311. For more version details download the MDGP2013_MSPVersionList.xls file. For the install guide and a list of issues fixed, download the GP2013R2_update_guide_ENUS.pdf file. Both files are available from the main Service Pack page (or from the links here).
Service Pack pages for all current versions can been found on the Developer Articles & Links page.
Note: Please do not post questions about technical issues in the comments, you would be best to post on the newsgroups (links in right hand panel) or create a support incident.
Well done to everyone involved for getting this release finished.
(PS from Patrick Roth - Don't blame David too much for the lateness of this post as he's been away and I've been a bit busy and hadn't gotten to update/publish this!)