New 66" Flail Mower was officially announced, has video:
"Clear brush and small trees up to 1/2" in diameter while distributing cut material evenly. Cutting width of 66". Floatation setting allows the cutter to float over uneven surfaces. Vehicle compatability: BRUTUS HDPTO BRUTUS HDPTO DLX BRUTUS HD"
That I could use, I mow about 20 acres of tall grass several times a year and it's no fun using the lawnmower attachment. Also up to 1/2" brush is about what I need to clear.
I bet it cost more than the $800 I spent on a new 5' brush cutter I bought for my compact tractor a few years ago.