Sprint’s variant of the Moto X is next in line to receive the update to Android 4.4.2, according to Motorola support pages. The update is build 161.44.32 and includes the same upgrades as the 4.4.2 updates for T-Mobile and Verizon models.
You are looking at improved battery life, cloud printing support, and an email sync fix. The update likely isn’t all that big, so should it pop up, it may only take 10 minutes to install.
To check for the update, head into Settings>About phone>System updates.