It is in fact a lot simpler than it looks. Basically, Lanark services now run to the High Level, freeing up space for the Whifflets to go to the Low Level. Hamilton Circle services now run through to Whifflet in effect, so the train coming off a Hamilton Circle run at Motherwell forms the service to Whifflet and on to Glasgow.
I've already raved about the timetable on another thread, I think it really reduces journey times and increases the number of seats, and will lead to a big shift onto rail. There are going to be losers here - off the top of my head, Bellshill and Uddingston lose direct services to the low level, Holytown loses 1tph, Hamilton-Wishaw is no longer direct... but the benefits outweigh these losses that are overcome by well timed connections and good bus links.
Nice to see a Sunday service at Whifflet (going through to Motherwell). May only be hourly (I can't imagine it getting much better in the short term future), but it could take some pressure off the busy nearby North Clyde Line - since the opening of Airdrie-Bathgate, it's almost full on Sundays!
On that subject, despite the widespread recast of the Argyle timetable, North Clyde services appear to be unchanged.
As i said elsewhere, the Motherwell terminator that comes off the Hamilton Circle is going to form the next train to Glasgow via Whifflet, and the same in reverse. This in effect means that Altnabreac's suggestion of Ravenscraig being served by Hamilton Circle trains is less likely. I think, if Ravenscraig does indeed go ahead, we'll be looking at initially an hourly service terminating at Wishaw as an extention of the Whifflet terminator, which reinstates 2tph at Holytown. If there is demand for 2tph, you could do this:
2tph Cumbernauld-Motherwell-Hamilton-Glasgow
2tph Glasgow-Whifflet-Ravenscraig-Wishaw
Which would not alter the current service pattern through Glasgow Central LL or reduce any frequencies on the new timetable, give Ravenscraig 2tph, create even more direct links.