Acer has announced they will be the first to bring Chrome OS (the operating system of Chromebooks) to a tablet. However, I am not sure that this will make much of a difference in schools.
First, most schools that want Chromebooks to function as a tablet, have already purchased devices that can accomplish this. For example, there are several chromebooks from Acer, Asus, and Lenovo that can flip into a tablet, as well as flip back to function as a traditional laptop.
Is there an advantage to getting rid of the keyboard on a chromebook?