The 48hz is a bug with the intel driver. I did rollback of the driver so the system relied on the microsoft display driver and i got the display up to 64hz, however by not using the intel driver it proves some other difficulties(like not being able to adjust resolution). I've tried to override via the nvidia control panel, but it cannot be done because on laptops because of the iGPU. I love this computer overall, it's perfect for people like me who often work/watch movies/game occasionally, though if you're after a pure gaming laptop I would consider other possibilites. This computer doesn't seem like it's meant for day out and day in gaming, that's impossible at the sleekness of this machine as it will turn relatively hot(though not uncomfortably hot from my point of view).
If the 48hz is the biggest worry for you I would not consider that an issue. I'll bet it will get fixed in the upcoming months, though I hardly feel that it's a problem if you're not an FPS gamer.