What you need to know In an interview with Wareable, a OnePlus rep acknowledged that the one-size Watch 3 "remains heavy for a small wrist." He promised that they will "fix" the lack of a small option this year, which could suggest a smaller OnePlus Watch 3R or Watch 4. He also discussed the reason why the OnePlus Watch 3 only has an LTE version in China. As much as the OnePlus Watch 3 has impressed us so far with its incredible battery life, we don't know how long it would last with a lighter, more comfortable case size. But…