It's not new. Same problem has been happening on a small amount of bikes since day 1 of the FJR. Mine does it. Dealer said it's normal. Being one who doesn't trust dealers (most of them), I had the dealer listen to it, verify in writing that the noise is there, have a printout of the service call and their "normal" statement.
No way I'm letting them strip apart the tranny without a failure, so I just ride it.
My advice is to wear earplugs. Or just pretend like you're George Jetson on your way to Spacely Sprockets! Whir-whir-whir-whir-waah-waah-wahh-waah!!!
Now if it made this sound in all gears...the diff is probably shimmed incorrectly.