Not THAT different from pre-patch build.
Pre-patch looked something like
SV/Warden mail, Sorc shoes, Warden mail/SV, Frzn Mallet, Abyssal/Starks/Aegis/Warden into Randuins
now, it's something like
SV/Warden mail, Sorc shoes, Warden mail/SV, Rylai, Abyssal/Starks/Aegis/WotA/Warden into Randuins/Lichbane
As for role, a tanky mage, kinda like Vlad, but with a different style.
Try to sustain your presence and your damage output in team battles. When a foe gets focussed slap your Ult+Ignite combo on him and start focussing others down 1 by 1, constantly being in the fray as you try to keep your grey shield up.,