Caught this with the wife yesterday. Incredibly fun movie, and worth watching on IMAX. Vin Diesel seemed to be channelling his inner Stallone for a good part of it (slurring words, massive fistfights) and it offered closure to a number of characters from 2 Fast 2 Furious and Tokyo Drift, but still left the door wide open for a sequel.
Maybe it's because I grew up on comic books, but I saw that ending coming 20 minutes into the film, and I'm a fairly dense individual when it comes to movies. Wasn't there a sequel planned? I thought I heard rumours of that.