Amazon hasn't uploaded an image of this one yet, but a new book has arrived over in their general listings titled Power Ponies to the Rescue! Unfortunately it looks to not be a full on chapter book like the G.M. Berrow series, but it could be interesting regardless at 32 pages. No other information is available yet other than the April 7th release date.
You can find it over Here!
Thanks to Andrew for the heads up!
