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Android 4.1 (Jelly Bean) was announced at Google I|O 2012 on June 27, 2012.
(You can review the high level changes in Android 4.1 at the official Android Developer's site.)
Of course, not all devices will get this update right away and others won't get it at all. Each manufacturer and carrier often choose to add their custom modifications which tend to delay the official release.
When will each device get Android 4.1, either officially or unofficially, if ever?
See also:
This community wiki will list all of the known and rumored dates for devices. If you have an update make sure to follow the format that's been established, and the following guidelines:
Note that devices that do not meet Google's Compatibility Definition will not receive a Google-sanctioned update. In the case of the major manufacturers and many others, that means they won't release an update at all since Google's certification is important to their business.