Samsung has started rolling out official Android 4.1.2 ROM for the Galaxy Tab Plus users. The company released official ICS for it back in August 30, 2012, where its users were updated from Android 3.2 honeycomb to Android 4.0.1.
You can download the update from here and its description is given below.
Galaxy Tab 7.0 Plus GT-P6200 ATO
Keep in mind that the update is for the P6200 only. Samsung will release update for P6210 as well soon.
Root Jelly Bean Galaxy Tab Plus
To root your Galaxy Tab Plus running Android 4.1.2 jelly bean, update to the latest CWM and flash root.zip.