Check under software settings to make sure an update isn't already available. If there isn't search around for a developer created ROM running Android Jelly Bean that you can download. Keep in mind that these are not official and might brick your phone. Read all the instructions before you download.
As far as I know, the Sony Xperia Arc upgraded only to Android 4.0 (Ice Cream Sandwich). You would have to flash a custom ROM to get Jelly Bean.
It is expected that the GT i8262 will get the Android 4.2 Jelly Bean later this year or early in 2015.
jelly bean and ginger bread are codenames for versions of Googles Android operating system, Jelly Bean is Android 4.1, 4.2, 4.3, and possibly later and Ginger Bread is Android 2.3.X
Android 4.3 OS (Jelly Bean) should already be available for the Galaxy Nexus.
4.2.2 (Jelly Bean)
The popular or code name for Android 4.1 is Jelly Bean.
Yes, the Sony Experia should be able to upgrade from Ice Cream Sandwich to the Jelly Bean upgrade. They started the upgrades in mid 2013.
No. Android 3.x was designed specifically for tablets and will not run properly on phones. However, you can update to Android 4.x which supports both phones and tablets. Alternatively, you can update to Android 2.3.x, but you will be sacrificing the new features included in ICS and Jelly Bean.
Yes it is. Its OS is Jelly Bean 4.1
Nothing really "happens". You still have the same phone but just not Android Jelly Bean. Your phone company may release an update for you or a custom ROM may have been created online.
The tablet in question runs android jelly bean
Android Jelly Bean is the name given to three major point releases i.e. v4.1.1 to v4.3 of the Android mobile operating system developed by Google Inc.