I don't know if your new horse will ever become hot, like your previous horse. He may become more forward, though. You may have to change the way you ride, though, for that to happen. If you are used to riding a horse that is so forward that you are always dampening that energy, this strategy won't work for a horse that needs you to amplify his energy.
So, you may bring up more life in new guy, but you have to really look at what you expect from him. I mean, do you expect him to move off briskly when asked? When he doesn't, do you accept that as , "well, that's just how he is.". He will only rise to the lowest level of your expectations, so raise them and be careful to consistently require him to come up to the new level, but be fair about it. You can build in more responsiveness.
As for the trail riding. I would find that a huge plus. I SO enjoy trail riding now and if thisguy is safer at it, that is really a plus.