Wave 15 of Office products reached the Release To Manufacturing (RTM) stage today, October 11, 2012 (10/11/12 – heh).
These products include Exchange Server 2013, Lync Server 2013, SharePoint Server 2013, and Microsoft Office 2013.
Note that RTM, also known as "code-complete", means that development is done on the products and they will now be written to ISOs, DVDs burned, retail boxes built, etc.
This does NOT mean that the releases are currently available. As of today, releases are still only available to TAP and RDP participants.
General Availability (GA) defines the timeframe when the releases will be available to everyone. This is targeted for first quarter calendar-year 2013 for all the Wave 15 products.
However, volume license customers will be able to download these products on the Volume Licensing Service Center (VLSC) by mid-November and the products will be on the VL price lists starting December 1, 2012.
Specifically for Exchange, the build number for the RTM release is 15.0.516.32. Exchange 2013 was code-named E15 throughout its development cycle.
For your information, "Wave 15" refers to the fact that version numbers of all Office product lines have been synchronized. The major version number for all products is "15".
For more information about Exchange, refer to the Exchangae team blog: The New Exchange Reaches RTM!
For more information about the other Office products, refer to the Office blog: Office Reaches RTM.
It is interesting to note that both releases refer to "the New Exchange" and "the new Office" – taking a cue from Apple, I presume; in not tying the announcement to a specific release of the product.