Samsung has not told us which devices will be receiving Android 4.1 Jelly Bean, but I will make some educated guesses based off of past trends. Samsung usually gives one core Android update. The updates do tend to take quite a long time though. First let me tell you which devices almost definitely will not receive the update. The original Galaxy Tab, Galaxy Tab 10.1v, Galaxy Tab 10.1, Galaxy Tab 8.9, Galaxy Tab 7.7, Galaxy Tab 7.0 Plus, and the Galaxy Note will not get the update. Most of those devices will end up on Android 4.0 Ice Cream Sandwich though.
I would wager that all the Galaxy Tabs that launched with Ice Cream Sandwich will get the update to Jelly Bean. That means the Galaxy Tab 2 7.0 and the Galaxy Tab 2 10.1 will probably get updated to Jelly Bean. The Galaxy Note 10.1 will also probably either launch on Jelly Bean or receive an update to it.
Of course this is all speculation until Samsung tells us their update plans.