The "New Torah" of Moshiach

"A New Torah will be come forth from me." (Vayikra Rabba, 13:3)

"The Torah of Moshiach is on a much higher level than the Torah that was given at Matan Torah. The Torah that a person studies in this world -- is mere vapor before the Torah of Moshiach." (Koheles Rabba, 11:1 [8])

The new Torah that will be revealed by Moshiach is a part of and is included in the Torah that was given to Moshe Rabbeinu from Mount Sinai, meaning that it will be according to the rules of Torah that were given at Sinai.

Lubavitcher Rebbe, Sefer Hasichos 5752, II:568