If it's anything like the Convention of States proposed by the Citizens for Self-Governance, it will not be a "Constitution Convention" but an Article V Convention of States with an agenda LIMITED to proposing amendments that cuts the size of government and limits taxes. It's a very hopeful effort.
An actual "Constitutional Convention" is itself illegal and unconstitutional.
There is nothing in the Constitution that limits what a convention can propose.
Article 5: The Congress, whenever two thirds of both Houses shall deem it necessary, shall propose Amendments to this Constitution, or, on the Application of the Legislatures of two thirds of the several States, shall call a Convention for proposing Amendments, which, in either Case, shall be valid to all Intents and Purposes, as Part of this Constitution, when ratified by the Legislatures of three fourths of the several States, or by Conventions in three fourths thereof, as the one or the other Mode of Ratification may be proposed by the Congress;
An actual "Constitutional Convention" is itself illegal and unconstitutional.
Thank you for correcting the misconception that an Article V Convention would be a Con-Con. Also, anything that an Article V Convention proposes must be ratified by three-fourths of the States in order for the proposal to become part of the Constitution; same as when the Congress has proposed an amendment.