I love how this rank has already been criticize already with no details released on it yet and has been going off of pure speculation. The platinum rank is indeed a rank that will be entirely optional to purchase as it does include almost everything diamond has however with some aesthetic changes and perks in the hubs and in-game. MCGamer has always been trying to be a cheaper alternative compared to other communities in which adding lifetime added a longer term issue on making sure we can afford upgrading and maintaining everything. Like everything here, all paid accounts are completely optional and does not add any "pay to win" features within the gametypes. So if you don't want to upgrade, you dont have to. Diamond ranks will also get more perks as well with this new rank push to clarify that rumor.
Lastly, current diamond premium players will have a separate upgrade path to match the value of this new rank. Platinum was intended to cost $100 but if you have a diamond rank currently, it will be only $25 upgrade (during the sale weekend, $20 if you catch the 2YEAR promotion). If you have no rank or currently an iron or gold upgrade account, you have to pay the full value.
More details will be addressed with the exact list of what you get and you can make the choice if it's worth keeping the current rank you have now or not!