According to Hasbro at Botcon, they invested over 2 million in Alternators and the 6 inch titanium and neither was justifying that cost. So both lines have been cancelled.
The last titaniums will be War Within Prowl and War Within Grimlock. They DO have prototypes for Arcee, Shockwave, War Within Bumblebee and others, no word yet on where those molds will eventually be put to use. My guess would be the Transformers Universe.
The next big wave of the Movie toys will come with something called "All-Spark" action, suggesting they will have new paint jobs and/or other gimmicks. This wave I believe includes Voyager Class Optimus Prime and Megatron.