yeah, hotrodimus looks the best, close second is either starscream or optimus... the others are meh, with megatron (totally unfortunately) bringing up the rear so bad that hot-rod is about to lap him. bumblebee looks awesome. totally on board for this series, without being a completist.
it looks like the aero-scoop on top of optimus possible turns into his gun or something? it definitely has break lines, as in definitely transforms. maybe it turns into his back, like the jetpack they sometime show him with or something.