Apparently, on the northern route there are some short crevassed sections, most of which have fixed lines in place.
On the southern route, there are supposed to be fewer crevasses.
I am planning a trip there this July; however, I haven't got a permit yet. Perhaps we could arrange to get on the same permit to save money. Let me know if this interests you. I will be in Kashgar at the beginning of July trying to find partners and reasonable rates for a permit and liaison. My partner and I both speak fluent Chinese.