I just saw this video on Youtube that prob most everyone else had already seen:
http://www.youtube.com/watch?v=lULXg3eDTlI
...which shows Shockwave talking about beings escaping from his lab that are too powerful, cannot be controlled and are heading to earth. And from the other video we have seen where Shockwave is presenting the Predacons and Predaking to Megatron, we may be able to assume it's not them he is referring to, since they seem under control. There seems to be more and more evidence suggesting that the Dinobots will appear.
Evidence the Dinobots WILL be in Beast Hunters:
* The above Youtube video
* The writers for season 3 saying that more old recognizable characters for both sides will show up in the 13 episodes that they have not announced yet
* The comic series: Rage of the Dinobots, tying FOC to TFPrime
* The new comic: Transformers Prime: Beast Hunters that is coming out in May showcasing the Dinobots (see link) : http://www.seibertron.com/transforme...his-may/26786/
* Unlikely they would have beasts only on one side (besides Thundertron we haven't seen much on the Autobots side beast wise in the new toys)
Evidence the Dinobots WILL NOT be in Beast Hunters
* No Dinobot toys on show at the Toyfair (though the Constructicons in Animated got no toys and they showed up. But then they didn't cost a fortune to animate in 3D)
* No news from Hasbro regarding Dinobots
* The claw that appears at the end of the Shockwave clip looks more like Predakings than Grimlocks
* The new comic still has the Dinobots on Cybertron, where it is likely their story will focus, rather than Earth
So will we see the Dinobots or wont we? I just don't know, though sadly at this point I am leaning towards probably not.