Sonic Worlds will always have a special place for the Multimedia Fusion crowd i.e. people who are skilled with that application but can't program in code. As the best and most accurate Multimedia Fusion engine it's not going anywhere. Sonic Classic 1 and 2 for example are both built in Fusion as was Sonic Axiom. Both used Sonic Worlds if I recall correctly. So was Freedom Planet if I'm remembering correctly here. This new engine is an exciting prospect but it won't replace Sonic Worlds. Both can co-exist amicably. So new demo when? Excited to play a new build of this. Maybe something is planned for SAGE?