Metro is by law prohibited to construct any surface rail in the Valley so no... there won't be any at grade stations on Van Nuys Blvd. This is also why we are most likely going to end up with enhanced bus service instead of rail on the 405 corridor.
I may be misreading this, but it seems that surface rail is not prohibited in the entire valley, but only on the Orange Line corridor, or thereabouts:
130265. In 1990, the Los Angeles County Transportation Commission
adopted an approved San Fernando Valley rail rapid transit route and
plan as described in the Findings and Mitigation Monitoring Program
adopted by the Los Angeles County Transportation Commission on
February 28, 1990, as an extension of metro rail or advanced
technology transit, other than light rail, that is a deep bore subway
through residential areas, unless modified through a subsequent
state or federal environmental review process. Therefore, the
following apply within the right-of-way of the Burbank Branch line of
the Southern Pacific Railroad:
(a) In the area between the western curb of Hazeltine Avenue and a
line parallel to and 50 feet west of the western edge of the
Hollywood freeway, there may not be constructed any exclusive public
mass transit rail guideway, rail rapid transit or light rail system,
or other track, other than as a subway system that is covered and
below grade.