The number of posts confidently predicting the future seems to have dropped a bit over the last couple of days for some reason, so I'll start:
May will make parliament's vote on approval of the withdrawal bill a free vote, which will help to protect her from any more letters going in, and also pressure Corbyn to do the same. Corbyn will remain as confused as he is now, and Labour MPs will actually vote independently, and faced with the fact that withdrawal in March is already written into both EU and UK law their choice will effectively be soft brexit or hard brexit, and against all the predictions enough of them will back the withdrawal bill for it to pass. Yeah, I know the world and his dog say May won't get the numbers, I think otherwise.