Considering that it looks like they removed the Honeycomb-style tablet interface from 4.2 in favor of something more consistent with phone and phablet modes, I'm now seriously doubting if the Xoom will get 4.2 or not. Looks like 4.1.2 may have been the last update, especially when you consider that the Nexus 10 will now serve the Xoom's purpose of being the 10" Nexus tablet. This theory also supports the reasoning that Google did such a minimal, lackluster job with the Xoom's Jelly Bean update (using the ICS boot animation, no sound search widget, no single finger notification detail in 4.1.2, no JB wallpapers, etc.) They probably figured that since they were ending support for the Xoom soon (since the N10 was coming), they could safely mail it in with the Xoom update and focus on the new tablet mode that the N10 is sporting.
I'd bet money that 4.1.2 will also be the last update for the Nexus S as well. Purely a guess, but I'd say the only non-current Nexus device that will see 4.2 will be the Galaxy Nexus.
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