I really love the new way his leg jets activate,
I agree, this is far more believable than any previous method. With the first episode of the 80s series simply showing the foot folding into the leg, but giving no idea of where it went when the jets were the entire diameter of the leg! Now, with smaller diameter jets that allow stowage room for the feet, it seems at least more convincing than before.
The manga and 60s anime both make it appear more magical than technological, but if we were to start nit picking here, where would we stop?
However, the short-arm weapon that he uses in episodes 6 & 7, seems implausible. Not only is there a jet in his forearm, but the whole forearm collapses as an antenna into the upper-arm to expose the weapon. While it is cool, it is far from convincing. There is simply too much in such a small area. He has such great physical strength, a jet, and a super weapon!
Oh, well, it might not be as much fun if it were too realistic.