Probably not in the immediate future. The TSP has a record of adding funds only rarely. It operated with just three funds, the G, C and F, for about its first 15 years of existence, then added the S and I Funds in 2001 and the L Funds in 2005. It has not added any since.
Proposals arise from time to time to add a certain type of fund, based on arguments that when compared with many similar private sector investment programs, the TSP’s range of fund choices is limited. However, the TSP governing board traditionally resists those ideas, arguing that the program is designed for broad-based, long-term investing and that the returns of smaller segments of the markets already are reflected in its index funds.