Kowalski–Michel–VanderKam mass equidistribution conjecture in the level aspect

Let $f$ be a classical holomorphic newform of fixed weight $k$ and level $q$, with mass $d\nu_f=|f(z)|^2y^{k-2}\,dx\,dy$ on $Y_0(q)=\Gamma_0(q)\backslash\mathbb H$. Let $\pi_q:Y_0(q)\rightarrow Y_0(1)$ be the canonical projection, and let $\mu$ denote the Poincaré measure on $Y_0(1)$. Kowalski–Michel–VanderKam's mass equidistribution conjecture. If $f$ traverses a sequence of newforms of fixed weight and increasing level $q\rightarrow\infty$, then the pushforward $\mu_f:=\pi_{q*}(\nu_f)$ equidistributes with respect to $\mu$. This is the level-aspect analogue of the Rudnick–Sarnak quantum unique ergodicity conjecture, reversing the roles of weight and level; the supplied text does not state whether it has been resolved.