When will my device get the Android 4.2 update (Jelly Bean)?
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