SEGA said that they'll be announcing three killer titles this year.
1. One will be announced at E3 in May
2. One will be announced at the TGS in Sept
3. and finally one will be announced at it's own special conference
Although I don't have a clue what the E3 and TGS games will be at this moment in time, I am 97% sure that number 3 will indeed be for Shenmue III and December is my safest bet for the special conference to take place.
Exactly 6 years from when the original was first shown to the world.
We shall see.