It makes him less of a lane dominator, and refocuses him to his mid game power spike (as opposed to being both prior). It also encourages his all in consistent fighting damage as opposed to dragging out the fight longer.
For most players, the second change won't mean much. It encourages him to continuously output his damage, instead of stalling the fight, making him more of an all-in ADC than he previously was, forcing more of a high risk/high reward playstyle on him (which fits with the gunslinging badass motif anyway).
In lane, he's still going to be excellent at trading without being oppressive to lane against, especially when he's duo'd with a kill secure champ such as Thresh (which I will always laugh at, btw)