Amazon has posted the cover to Transformers: Exiles, the sequel to Transformers: Exodus that kicked off the War for Cybertron continuity that informs Transformers: Prime and used concepts from the movies. The paperback novel by Alex Irvine is set for release on September 27, 2011. Below is the Amazon description of the novel.

The epic battles between Optimus Prime and Megatron have long thrilled Transformers fans. But these two giants weren’t always great leaders and bitter foes. This new novel continues the electrifying saga that started with Transformers: Exodus, unveiling the origins of the conflict—the explosive events that unfolded before Optimus and Megatron arrived Earthside, forever altering the destiny of their kind.

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Author Alex Irvine, who wrote Transformers: Exodus, recently tweeted the release date and title for the sequel, “Hey #Transformers fans: the new book will be called EXILES, and it's due out on September 27." Exodus was a Hasbro sanctioned book that is considered part of their new canon for Transformers history so likely this one will be too. An Amazon listing is now up with a paperback price of $7.99. Below is their description of the novel.Read More »

A statement from Hasbro US has provided new insight on Transformers: Prime and War for Cybertron as it turns out these two stories are actually part of the same continuity. From AllSpark:

A question was recently posed to Hasbro’s UK office asking if the Transformers Prime television series and the Transformers War for Cybertron video game were in a connected continuity. Unfortunately the wrong answer was delivered and that answer has made its way to the fan community. The TRANSFORMERS brand team would like to confirm that Transformers War for Cybertron video game, Transformers Exodus novel, and the Transformers Prime television show are in the same aligned continuity. Hasbro is creating a single continuity to tell the bulk of our TRANSFORMERS stories going forward.

Please look for further details about the continuity plan and new projects over the next year.

I am not sure how the movies tie into this but I suspect they don't, instead providing inspiration for this new Hasbro driven continuity. Transfans will have their own interpretation but below is my summary of the main official Transformers universes created over the last 25 years.

TF G1 - 1984 cartoon series, Transformers: The Movie, comics (Marvel, Dreamwave, IDW), Beast Wars, and Beast Machines
TF G2 - Short lived Generation 2 toys
TF UK - TF G1 plus UK comic books (most by Simon Furman)
TF Japan - TF G1 1984 plus the many Japan cartoons that continued after US production stopped like The Headmasters, Super-God Masterforce, Beast Wars Neo, etc
TF RID - Robots in Disguise series
TF Unicron - Transformers: Armada, Energon and Cybertron series
TF MB - Michael Bay films of Transformers, Revenge of the Fallen and Dark of the Moon.
TF G3 - Hasbro supported continuity currently derived of War for Cybertron, W4C Prequel Exodus book, and Transformers: Prime. Inspired by TF G1 and TF MB concepts.