Lego posted the "LEGO Mario" series of Princess Becky Princess Castle sets on its official INS account last night (March 9) and then quickly deleted the post, considering that "Mario Day" is March 10, it may be the official announcement of the new set prematurely.
Someone had already saved some of the pictures before the official deletion, and the following are the leaked ones:
More details about this set have not yet been officially announced, but there is a countdown on the "Mario Day" page of the official website, and the deadline is 22:00 Beijing time on March 10, when the official may officially announce the set.