We are only currently have one 4.8 build machine here, so we havn't made releases for any other freeBSD OS's. That's not to say it won't work, but I can't say it will.
There are some definite changes with 5.1 but I'm note sure how they will effect DA. Most people who run Dual Proc machines will be running 5.1 because it has much better dual proc and hyperthreading support. Making DA 5.1 compatible would be great if possible.