Actually, due to the Rule of Unintended Consequences, this change might make it a little harder for guests who get FastPass+ on the day they arrive at the Park.
Let's say you fly into Orlando and don't get to the Park until 2:00 PM. Presently, everyone visiting the Park is limited to three FP+ selections. Some guests who arrived at the Park when it opened might have already used up their allotment of FP+ by the time you arrive at 2:00 PM. Those guests can't compete with you for FP+ for the rest of the day. However, with this pending change, those guests who arrived before you can get more FP+, meaning there is more competition for the remaining FP+.
Our next trip to WDW is in mid-May and we've made a few FP+ selections. For the most part, our strategy is to select FP+ times starting around noon or later, thinking that between Park opening and noon we'll ride standby (when crowds are usually not that bad). Now, I'm wondering if we should book FP+ times for as early in the day as possible and then try to snag our 4th and subsequent FP+ starting around noon or later.