OnePlus Nord 3r earbuds' launch date is yet to be revealed.
The same model number recently bagged the FCC certification. The listing shows the accompanying charging case has the model numbers: 112570 and 761832-B1, respectively. This also showed each earbud packs a 58mAh battery. This is a significant upgrade over the 36mAh cell on the Nord Buds 2r. However, the charging case' capacity is downgraded from 480mAh to 440mAh. This is probably to balance out the weight distribution.
The images on the FCC show the top cross-section of the charging case. This shows the earbuds could be placed vertically in the carry case. This is similar to the first-generation buds. The OnePlus Nord Buds 3r have also received the BIS certification, which means they will be heading to India much like the predecessor. However, the listing doesn't clearly reveal the hardware features.
While the price details should only revealed at the time of launch, the Nord Buds lineup is an affordable TWS lineup as opposed to the more premium OnePlus Buds. They could be priced under Rs 3,000 in the country and offer all the required features.