I heard that A330's are being upgraded at the moment. By the end of this year most of the A330 fleet will be configured with the new seats and IFE in business class. If you check out THAI's schedule in the months near the end of this year, you won't see equipment code 330 anymore. All (or almost all) A330 flights will be operated by equipment code 333 which stands for A330 with new business class.
For 777's I also heard that it's delayed until maybe the end of this year.
Economy class seats and IFE will not be upgraded at this moment.