This review will have no spoilers, so feel free to read it through!
This movie is absolutely fantastic! I saw it over the weekend with some friends and it was absolutely amazing. Every reference nod, every quote, every scene is so memorable, and Idris Elba as Knuckles and Colleen O'Shaughnessy as Tails KICK ASS! Jim Carrey does an excellent job as Robotnik once again, and I hope they all reprise their roles in the upcoming third film!
I highly recommend you see this in the movie theater for the best experience, and be sure to stock up on Sonic merch and chili dogs! Be sure to look out for references, key themes and character development - despite a slow start, this movie speeds up till the end! Oh, and be sure to stay for the after credits. There's bound to be tons of discussion of the ending, so if you haven't seen it yet, beware of spoilers!
Other than that, enjoy. Get those blue raspberry and wild cherry slushies, overbuttered popcorn and go see that film ASAP! There's bound to be other fans excited just like you, so be prepared for participation! I'd talk more, but I worry my yapper would spoil shit, so I'll keep quiet for a while. Gotta speed, keed!