1. Rivian's R2 model will include a lidar sensor for autonomy. 2. Lidar costs have significantly decreased, enabling its integration into consumer vehicles. 3. Rivian aims for fully autonomous vehicles with the new in-house chip. 4. The R2 will launch without lidar in 2026, costing $45,000. 5. Rivian's approach contrasts with Tesla's camera-only strategy for self-driving.