When we first saw the proposal to split the Weybridge-via-Hounslow service into two bits, I pointed out that:
One awkward change which will annoy a few (possibly very few) is not running the Hounslow loop stoppers on to Virginia Water, but starting a separate Weybridge service there. Worse, initially they will be using the same trains and running them ECS▸ Hounslow-VW; I can see that going down well.
They means that from e.g. Kew Bridge out towards Reading is no longer one change at e.g. Staines, but change at Hounslow and again by Staines (only 2 tph to Windsor will go via Houslow and turn right). Changing at Twickenham might be faster, but at the moment it's not valid on the cheapest ticket.
That have addressed the connectivity issue, by running the inner bit of the service (all stops to Hounslow) round to Twickenham, where it will now reverse to run ECS to Virginia water. That's in the timetables, though a little hard to follow, but the words about it don't make a lot of sense:
The Waterloo to Weybridge service is split into a Waterloo to Twickenham via Hounslow service (with connections available at Twickenham for Kingston, Reading and Richmond), running every 30 minutes and a Virginia Water to Weybridge shuttle service operating every 30 minutes calling only at Vauxhall, Clapham Junction, Putney, Brentford and Hounslow.
That bolded text seems to have been misplaced; it refers to the 2 Windsor tph which are the semi-fast ones:
For the first time in over a decade a semi-fast service will be provided all day Monday to Saturday on the Hounslow Loop, including the peaks calling only at Brentford and Hounslow. This maintains connectivity from the Hounslow Loop to Feltham and Staines whilst also considerably improving journey times from Hounslow and Brentford to London (up to seven minutes quicker). Earlier and later trains will also be provided on this route. This increases the off-peak Windsor Lines services from 12 trains per hour currently to 16 trains per hour.