For pre-season development I have my eyes on a tropical wave which for several runs has been shown for several runs to move off of South America into the Caribbean in around 7-10 days. It will potentially move NE to the open Atlantic, as shown by this 018z GFS run, where it might be able to align along the shear vector at some point and develop. Waters are certainly warm enough
SAL and high wind shear from zonal continental flow is currently dominating the basin (typical in Mid-May), so the tropical Atlantic is going to be shut down asides from a potential sneaky system for some time. However, MJO is moving into the basin in late May, and as the ICTZ continues to tick northwards and pockets of lower shear start to pop up, things will start looking more favorable for some early-season development, and one of the most hyped seasons in years will truly begin.