When will my device get the Android 4.2 update (Jelly Bean)? Android 4.2 (Jelly Bean) was officially announced on October 29, 2012.

(You can review the high level changes in Jelly Bean 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 4.2, either officially or unofficially, if ever?

See also: 


When will my device get the Android 4.1 update (Jelly Bean)?
When will my device get the Android 4.3 update (Jelly Bean)?
When will my device get the Android 5.0 update (Lollipop)?
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:


Keep phones in alphabetical order listing the manufacturer and model
Specify if the date is confirmed or rumored and link to the source
If there is an unofficial release, link to the site where it can be downloaded


Phones

HTC


One (Developer Edition): skipping to 4.3 (source)
One S: Never (confirmed)
One X: 2013-06 (rumor)
One X+: 2013-08-12 Taiwan (confirmed)


Samsung


Galaxy Nexus: Released - November 13th, 2012

Bell Canada: 2013-03-08 (confirmed)
Verizon: 2013-03-19 (official)

Nexus S: Never (source). There's an unofficial release, see also this thread.


Sony


Xperia Z: 2013-July (confirmed)
Xperia ZL: 2013-July (confirmed)
Xperia ZR: 2013-August (confirmed)


Tablets

Asus


Nexus 7: Released - November 13, 2012
Transformer Infinity - April 3, 2013 (confirmed)
Transformer Pad TF300: Released - March 3, 2013 (source)


Motorola


Xoom: Never (source)


Samsung


Galaxy Note 8.0

Wi-Fi only: 2013-10-07 (confirmed)

Galaxy Tab 2 7.0: 2013-08-13 UK (confirmed)
Galaxy Tab 2 10.1: 2013-09-23 (confirmed)


Sony


Xperia Tablet Z: 2013-August (confirmed)


Other

GoogleTV


LG Google TV: 2013-10-14 (source)
All ARM-based models - 2013-05-16 (source, source2)
All 1st gen Intel-based models (e.g. Logitech Revue) - Never