The ripples near the brightest white are gravity waves propagating outward from the deep convective burst. This image is a little old, couple of hours, but shows the convection engulfing the center of circulation. The image below shows how intense the convection really is with -80 Celsius and colder cloud tops.
The NHC wind probabilities indicate that the chance of Leslie reaching hurricane strength is about 50%. Again I think that this may change sometime through the next few forecast cycles due to the more favorable environment around the storm, and better storm-centric organization.
The next few graphics show the numerical probabilities, and updated Tropical Storm/Hurricane force winds graphics.
I will keep an eye on this one. Leslie is at least proving interesting from a forecasters point of view. Last note...surfers along the Eastern Seaboard, and the boarder islands between the Caribbean and Atlantic are going to have great surf.