You are right that the A380 will operate as SQ221 departing SIN at 2035 arriving in SYD at 0710. However, it will depart SYD as SQ232 at 1245, arriving in SIN at 1745.
As for the names, SQ has gotten rid of all their names from Big Top to Megatop to Jubilee, LeaderShip, MegaArk, Raffles Class etc. Only Krisworld, Krisflyer and Silver Kris remain.