So the big announcement... im hearing 2 things.

#1 - MP announcment- Its Masterpiece Ultra Magnus. The MP10 was a new mould to handle an Ultra Magnus trailer. (they have made it, but unsure if they will announce it). Galvatron is also being looked at.
Masterpiece has been exceptionally successful since MP-08 (Rodimus) and the cars are the first ones on the list. Expect more seekers, a sunstreaker (you remember they have the lamborgini licence now).
I believe that they have made prototypes for at least 5-6 MPs but await licencing agreements with car companies.
(Rumor is - Jazz, Mirage, Wheeljack, Sunstreaker...)

#2 - Encore - I have mentioned this before - Scorponok was one being looked at, same with Dinobots. Takara wanted to test the market to see how many people would by the most expensive toy out there - Fort Max. Its basically sold out everywhere here in HK, so they are completely surprised by it.

The G1 market is super hot and having 30+ year old men being able to easily spend $200US on these shows its worth keeping them around.