There is a post about 2.2.8 and you do not have to re-do rules. At some point rule machine legacy goes away, but your rules will be transferred to RM and you will not need to update them unless you want to. Read through post below.
I thought I read that RM legacy would be transferred to RM5 at some point, but now I am not sure as I don't see that in the post. It is made clear, however, you do not need to change any older rules.
