Looks like Kernel 5.6 is not going to be in Arch repositories. It is already available for other distributions. I was reported that there are also problems building Realtek wireless driver with Kernel 5.6 on other distributions.
If that is the case it would indeed be better to wait until Kernel 5.6.1 is released.
This is most likely the final 5.5 kernel update before 5.6 will hit the repo. Often you must install this one to make the transition to 5.6 without (big) issues.