Megayachts with icebreaking capabilities

When I read about Northern Star and the fact that she has "Ice Class 1D", I not only wondered what exactly this means in terms of how much of an icebreaker that vessel really is but also if there is a trend to yachts like Northern Star or some of the upcoming explorer-style yachts being capable of reaching remote places in the Arctic or Antarctica?

Arctic P has some icebreaking abilities for sure but how about Octopus, considering the multi-purpose features this yacht has?