No way they are keeping the old classic line
Like there is so little changed here... What's the point in having two near identical products... That follow two completely different size charts.
Most truck companies have multiple price-point trucks.
The difference between the Ace classic and AF1 seems more substantial than say a Venture high vs Venture v-hollow when you think about it. The latter is just a difference in axle, kingpin, and plate manufacturing technique whereas the Aces use a completely different type of aluminum, axle, kingpin, pivot cup, nuts, and (currently at least) sizing. It is just that the emphasis isn't on weight reduction.
Re:the sizing, they have a shit ton of classics sitting around that need to sell. I'd be willing to bet that down the line they scrap the different sizing for most (if not all) of the trucks.