Motorola smartphones have mostly pure Android and get very timely updates now Moto customer support is claiming that the Moto X and Moto G will definitely be getting the L update. As for the entry-level Moto E the support team has no information yet.
Customer support isn’t the most reliable source of information the decisions to update a phone or not are made higher up and only after in-house developers have had a good look and evaluated the possibilities. Considering Android L isn’t even final, it may be too early to be talking of definite updates let alone time frames.
