N.Y. Comp. Codes R. & Regs. tit. 22, § 207.23
(a) In any probate proceeding in which objection to probate is made upon the grounds that the execution of the propounded instrument was procured by fraud or undue influence and the proponent demands or moves for a bill of particulars, the proponent shall be entitled as of course to the following information:
(b) If it is claimed by the contestant that the instrument offered for probate is not the last will of the deceased, the proponent shall be entitled to a bill of particulars as of course, which shall state: