Personally, his build route hasn't changed much, but he could be more encouraged to building a rylais as his third or fourth item.
Start - Dorans ring + potions
Sell after it's unneeded
Sorcerers shoes
Chalice into Athenes Unholy Grail
Rylais/RoA/Ludens/Seraphs (Ludens is great assist for his waveclear and popping in some additional damage on players, even if he already has great waveclear)
Rabadons
Void Staff
Hourglass
This tends to be my general path. I tend to start with two faerie charms to get chalice sooner along with remaining gold for potions, grab Chalice for the mana sustain and magic resist against early opponents, and rush to build into Athenes for the mana sustain from its assist/kill passive 30% regen.
I'll get boots next, and if i'm short on gold from pressure or no kills, i'll upgrade the boots, then get Aether Whisp for Ludens (more movement speed always helps) and grab a Large rod that will allow me to build into Rabadons or Ludens if I feel whichever would be more impacting to get first.
Afterwards, i'll get Seekers armguard and grind its 30 stacks while I get the equipment for void staff. Afterwards, my final grab would be another large rod to complete hourglass.