Im excited about this bike as well. I'm looking forward to reading your review. I hope you take it on some routes that are not "perfect" for the bike as well, to see what it is really capable of. I'm also curious to see what you think of the carbon fork. I was surprised by that when I saw it.
Although I've only got about 175 miles on the Deadwood, I've easily put over 4,000 on my two Fargos, with probably half of that on rough gravel and singletrack. So, I feel I can speak with confidence about the Deadwood's aptitude at this point.
The only place where bikes like the Fargo and Deadwood begin to feel out of place is on long stretches of mildly technical singletrack, particularly on long descents. I feel they can handle the slower speeds of the climbs in this type of terrain, but once pointed downhill, a couple factors come into play. The first of which is the demands that braking places on the rider. Avid BB7s are fine brakes, but when paired to road levers, they don't exactly offer the most powerful leverage. To really get the full command of the brake lever, you really have to be in the lower, more aggressive, drops. You just can't power on the brakes from atop the hoods...safely.
So, when the trail gets gnarly with lots of steep sections littered with roots, rocks and things that require constant braking vigilance, your only hand position is in the drops, which isn't bad, but not nearly as ideal as a wide flat bar. Even with wide Salsa Woodchipper 2 bars, that drop position is pretty narrow for that type of technical riding. I will say, the extra tire width of the Deadwood not only helps braking traction, it makes the ride more compliant and controlled. Modulating BB7s with road levers in tough singletrack gets tricky.
With regard to the carbon fork, it's a beautiful pairing to the Deadwood. I swapped out this same fork on my Fargo with a Rock Shox Carbon WC SID suspension fork, and it needs it for rough singletrack descents. The Deadwood could be fun with a suspension fork, but thus far I don't think it needs it. The fork doesn't limit it's technical singletrack prowess nearly as much as the bars do. But, don't take that as a strike against the bars. When they're in their element, they are the perfect choice.
In short I'd consider Deadwood turf to look like: (Comparing Fargo to Deadwood, to say a Spearfish)
Pavement: Rolls way better than you think it would, but the extra tire meat is not best used on tarmac. (Advantage Fargo)
Gravel: Same. Nice fast rolling bike with comfy compliance. (Advantage Fargo)
Doubletrack and Jeep road: This is the turf of the Deadwood. The compliance of the tire is the big factor in logging big miles of rough road. (Advantage Deadwood)
Mild Singletrack: This is also the turf of the Deadwood, but there will be some compromises made over a standard mountain bike with straight bars. (Advantage Deadwood/Spearfish)
Technical Singletrack: The Deadwood does great on the ups. You just have to be patient and attentive on the downhills. (Advantage Spearfish)
I fully anticipate riding more singletrack on the Deadwood than I did with the Fargo, and already have. The difference is incredible when it gets technical, but I don't think the Deadwood would be anyone's first choice as a singletrack ripper. I will say, it rides just as superbly fully loaded as it does with just one bottle. Such a fun bike.
In short, the ideal miss-mash of terrain for a Deadwood includes pavement, gravel, doubletrack, mild singletrack and even technical singletrack if you are careful with the long downhills as they will not be fast or fun. I'm talking long, multi-mile downhills with technical elements.