Got this off Lahore Metblogs actually, but i believe it deserves a mention here as well. I really loved travelling on Karakoram Express as it was a very well maintained service. I hope Sindh Express will live up to the KE or preferably go beyond it!
From LMB:

After Karakoram Express, Pakistan Railways is launching a new high-speed railway express service between Lahore and Karachi.

‘Sindh Express’ will make only four stops at Khanewal, Rahimyar Khan, Sukkur & Hyderabad throughout it’s journey from Lahore to Karachi. Brand new Chinese coaches are to be run as Sindh Express.

From Dawn:

Within a month after the launch of Margalla [Lahore-Rawalpindi] and Marvi, Pakistan Railways is going to launch another non-stop train between Karachi and Lahore on July 24.

Railways Minister Sheikh Rashid Ahmad said at a press conference here on Saturday that the new train, Sindh Express, will complete its journey in 15 hours.