This is old news. This hearing happened several months ago--I have a copy of the transcript at my office however I am out of town and don't have access at the moment.
Doesn't mean that it won't happen--not only are these people active but Congressman Jim McDermott(D) from Seattle who is a member of Ways and Means has been pushing this issue for over four years.
I have heard that the office of the Deputy Secretary for Tax Policy is interested in the issue but that is loose gossip so far--your title implies the Administration has some current interest in action--I don't know of any; do you? Do you have a cite.
At present, Administration, Ways and Means, and the tax policy office all have a substantial workload in other areas. To the extent they stay occupied, this is likely to be a secondary issue in my judgment--if you see real current news to the contrary, please post it or send me a PM.
Congress sent out a letter to the admin about nationalizing retirement: http://www.humanevents.com/2010/05/04/republicans-sound-alarm-on-administration-plan-to-seize-401ks/