4.1 will still be ICS, Jelly Bean will be 5.0 when it's released. I wouldn't even start to think about Jelly Bean since there hasn't been any information release regarding it. We may see it at the I/O conference in a few weeks but even then I wouldn't expect to see JB until next year.
Past Devices: Google Nexus One (sold), Samsung Galaxy S2 (sold), B&N Nook (returned), Samsung Galaxy Tab 7 (sold), Samsung Galaxy Tab 10.1 (On the Shelf)
Current Devices: Samsung Galaxy S3 (AOKP), Nexus 7 (Stock), Chromecast