Roth is likely, but not for this year.
Thrift Board has discussed this several times in meetings. Greg Long says he's not sure if there would be a demand for it, although several members of the board have suggested moving it forward. Long asked earlier this year for more time to study it, the ramifications of it, and how it would be done.
They ended up this year recommending it be included in legislation, and that is how it ended up in HR 1108. That passed the house, but has died in the Senate. Any action yet this year on it in the Senate is very unlikely.
My best guess is Roth will happen, but probably not until 2009, and maybe not until late in the year
Congress is done for the year now for the most part. Anything will have to wait until next Congress, and it will be more than likely that there are other, more pressing things for the next Congress to start off with.
The good news is that both the Roth issue, and a "self-directed window" included in the HR1108 legislation, as well as a provision for Sick Leave Buyout for FERS has Senate Democrat attention. Assuming a major sweep for the Dems as is projected, this legislation is very much likely to survive to be reintroduced by the next Democratic held Congressional session.
I think we'll probably see it again in the House in the spring, and then in the Senate by next summer. Not the first thing out of the box in the new year, but somewhere in the middle of the session, and it should pass.
then- who knows- it may take the TSP Thrift Board a few months to get the software updated, and produce materials for people before it is released.
My best guess- Roth will become available as a Christmas special next year.
Ho Ho Ho.