Word is that the city of Arlington will definitely NOT be building a Velodrome as part of the north tract development. This does not mean there will be no Velodrome or not in Arlington, just not on the North Tract. WABA was promoting this and had support from other groups as well, but it sounds like it was shot down pretty convincingly at the Oct 29th meeting.
The North Tract will still be a bicycle friendly development. It will include a multipurpose bicycle trail, a bike lane along Old Jefferson Davis Highway, a bicycle overlook, and most importantly - two much needed connections to the Mount Vernon Trail near the 14th Street Bridge,
These connections would be made via (a) the Humpback Bridge route, where renovations are currently being planned by the National Park Service, and (b) a more direct crossing from the North Tract across the GW Parkway.
Crossing the Potomac on the 14th Street bridge bike lane can be frustrating since there is no where to safely cross the GW Parkway between Arlington Memorial Bridge and the Crystal City tunnel. So even one crossing would be a huge improvement.