in the USA the plastic sleeves have historically changed very little. So take away some *potential* of printed blurbs, add some subtle design elements and offer protection is just a plus. Nothing major, not like the price point suggests that of an Asian premium import or nothing, but a nice add on none the less.
The art of the steel, while it is different then most people's tastes so far it seems, does however play in hand to the movie. So if some have not seen DP2 it seems hard to cast judgment. One day , some day, any day we will ALWAYS get the regular poster art for a steel. Might as well get creative variants at launch/release as you won't get them very often afterwards. The Deadpool franchise however seems to be one that has a lot of freedom, so its obvious there will plenty of options a long the way for the foreseeable future.