Shanghai Airlines is taking delivery of B-1901 (c/n 38060, l/n 4653) this morning. The 737-86D is making its delivery flight from BFI as CSH207, and will overnight at HNL. It's seen above, pulling into its parking spot.
It appears that the People's Republic of China has begun assigning the B-19xx registrations to 737NGs, since the B-59xx block is being given to A320 series airliners. There are still B-58xx registrations available, and assigned to 737NGs as well.