I don't have any info on the middle or long other than where the model events will be. I do have info on the Sprint but I think it will change so I'm hesitant to give you the preliminary lengths. If the sprint distances make a big difference to you (I mean it pretty much sounds like you are planning to enter blue, green blue based on your above comment), let me know and I'll see what I can release.
For the middle and long, there were events there in 2003 and the results are here
I think the 2003 course distances at Burnt Mtn. where 8.0 K for blue, 6.6K for Red, 4.8 K for Green. At Storrs Pond-Oak Hill, I think the 2003 course distances were 7.5K for Blue, 5.9K for Red and 4.4 K for green. Of course the woods have probably changed and the map has been updated but the above distances and times should give you a rough approximation of what to expect.
Oh, and as you know, TGIF will be there so you need to factor that in to.