The news has been found in new books listed on Amazon.co.uk. The first, Steam Team!, reveals no new information. The second, Rail Blazers!, gives us a little insight as to the plot. Fires, secret plans, and double-crossing engines can't derail Thomas! is the description. The third book, however, is the most interesting. Entitled Flynn Saves the Day, the description leads as follows: Flynn the fire engine arrives just in time to help Percy put out a fire and save Thomas.
Draw your own conclusions.