Actually Motorola had a terrible reputation for updates until it was bought by Google. Having a Moto "Blur" OEM ROM meant rare updates.

Google ownership obviously helped out here, but soon they'll be transferred to Lenovo. Will the same commitment to updates and "light" modifications continue? Who knows. Lenovo's company culture is all about heavy modifications (boot a Lenovo Windows machine to see all the crapware if you dont believe me).

Moto's future is an unknown due to this sale.