The FIPA will apply to current investment and future investment. The only portion of the treaty that does not apply to future investment is the national treatment at what we call the pre-establishment phase—that is, before the investment is actually established—but every other provision of the treaty applies to existing investments and to future investments that are established, and to those wishing to establish for most-favoured-nation treatment.
On October 18th, 2012. See this statement in context.