We just placed an order for a new 4MOTION Ocean yesterday; our order is now with VW where it will stay until August when it will be worked into the production schedule. According to what the dealer told me, there are no major changes planned for the MY19 Cali other than perhaps the odd minor tweak/fix. The only thing he said may change between now and August/September are possibly the prices (and that the TSI can no longer be ordered).
We also had to sign a form saying that we understand that between the point of order and the point of delivery that the emissions/MPG/VED "could" change; although for us the VED likely won't change because we are already in one of the higher brackets (road tax for ours is £1,760 for year 1 and then £450 per year for years 2 through 5 then £140 per year from year 6 and beyond).