Changes for 2019 that I can see:
Pro 0 - is gone (SRAM eTap)
Pro 1 - loses the carbon SLR 1 wheelset; also loses Dura-Ace TT bar shifters (Ultegra instead); and keeps the exact same paint scheme. Seriously, exactly the same...?!? Keeps DI2. Price is 5000 down from 5560.
Pro 2 - new addition in 2019 - drops down to an Ultegra mechanical groupset; same alloy wheelset as the Pro 1