The short answer is, I think it is coming, but I don't know when.
Certain versions of the Tab 2 in certain regions of the world are getting Jelly Bean now... Samsung seems to do what every other android company does as far as announcing releases... One of the following:
1) Not announced, sometimes will be released without announcement.
2) Announced, with a release date of "Coming Soon" or similar.
3) Announced with a release date of "Released" for something that has already shipped.
Even though some reliable sites report being told by Samsung that JB was coming for the Tab 2, there is no indication of tablet releases on the Samsung site. Therefore, I am thinking we will fall under #1, possibly followed by #3.
However, there are people trying to determine how to downgrade from JB... Apparently, they don't like the one size fits all aspect of JB (same layout on a 7" tab as on a phone).