The future for Roomba maker iRobot isn't in the sky; it's continuing to innovate on the ground. In a chat with iRobot CTO Paolo Pirjanian at the Engadget CES stage today, he dove into his vision for where the company is headed. And, surprisingly enough, drones aren't part of the picture -- even though they're all the rage now. Instead, Pirjanian says he's looking forward to building smarter and taller robots that will be able understand and interact with their environment. The keys to that dream are indoor GPS and 3D mapping, both of which, he says, iRobot is "keenly working on." Those futuristic home bots will be able to do things like collect and bring a tray of food to the elderly, or create an accurate map of everything in your home, so it'll know if you left your keys on the kitchen table.