Thanks for the info, very helpful. OK, so this bike seems to be an updated, fuel-injected version of the Grand Vista 250. As to the "Dink" moniker, motorscooterguide.net says...
In Asia, a “Grand Dink†is an affluent married individual with Double Income No Kids).
Now I know...
After posting my question, I found the specs for this model and, just like the Grand Vista, the engine is a two-valve SOHC that puts out 19.9PS/7,500rpm and 20.9Nm/6,500rpm, so clearly a budget model compared to the others in the lineup. This new version doesn't have electrically retractable mirrors, probably to keep the price down (The list price is nearly $2,000 less than the new Forza.)
I still like it though. From the photos online, seems less bulky than the Xmax/Forza, and there's more weather protection than the PCX. In a place like Tokyo where potholes are a rarity, the little 12"/13" wheels aren't really a problem. Glad to hear there isn't a huge difference in acceleration from the DT300i. Since this will be for commuting on surface streets, convenience/reliability trumps sheer performance numbers.
Anyway, I'm going to try and stop by the Kymco dealer in the next week or so and try to at least sit on the GDink 250i and the other models. Definitely need to see how much legroom there is with my 34" inseam.