[DTV]

Also weird for London to be till midnight, this means that if things stay as they are, first hour of Newsday will be operated by London, while the rest by Singapore. Why not hand it over to Singapore when Newsday starts?

And still not clear what about weekends - also Singapore and New York?

I suspect the midnight rather than 23:00 confusion might be a small misunderstanding/elision. Regardless of whether London is handing over fully or in part, would be very odd for it not to be at the start of Newsday. IIRC, the UK-opt ability also ends at 23:00. 

The weekend situation hasn't been clarified, but I'd expect a single overnight shift from Washington. Given additional resources have solely been allocated to it rather than Singapore, I don't think we'll see an expansion in the latter's output.