I haven't been back to Leh in a few years so I don't have the most up to date knowledge on how far the road has gone. I'd check the indiamike, or lonelyplanet message boards to see if anyone as been through in the last year. I'm pretty sure the road hasn't gotten through the Hanupatta to Hanumur section which is the most scenic part. I'd take the road as far as you can then hike until you reach the road on the Padum side take the road into town restock then take the road as far as you can in the Darcha direction then start trekking. Usually the sections where the road is are the boring flat sections anyway and from what i know about the speed of Indian road building I doubt they have made much progress up the passes. There also are some alternate passes into and out of the area but I haven't done them so I don't know the details. Glad you've found my site helpful.