Within the last hour, the Supreme Court's docket sheet for Case No. 10-1014, Virginia v. Sebelius, was updated to include this entry:
DISTRIBUTED for Conference of April 15, 2011.
Thus, the Justices are scheduled to discuss the petition at that conference. And the result of their deliberations will most likely be known by later that afternoon (if they decide to grant) or the following Monday, April 18, if they decide to deny. (Again, there could be a delay beyond this if one of the justices decides to write a statement or dissent from the denial.)