No. Nothing really has changed. Nintendo isn't living the fanboy dream of unifying their console and handheld divisions. Their next handheld might be running a similar OS to the Switch but it will not be based on the Switch. They're being as clear as any business can on these points.
They did unify their divisions, though. That's not a dream, that's just that actuality that is the organization within the hardware and software engineering departments within the company. Whether that means one device or multiple devices, is as yet to be seen, but I think everyone could have seen them holding onto a successful platform until a new platform has proven itself on the market.
It wouldn't make any sense to say in an investor meeting that they were not going to continue developing for the 3DS, a platform that just saw YoY gains in sales, and was the platform that they released one of if not the fastest selling game in their entire history just last November.
Their stocks would have tanked, because investors want stability, and shucking off everything you have that's making you money while putting everything behind an unproven platform, no matter how transformative and obvious the value proposition, is ludicrous and chaotic.
So, nothing has changed, the 3DS/2DS will be the platform(s) aimed at the younger audience for the time being, and the Switch will be marketed hard at Nintendo's primary demographic (25-34) primarily with younger audiences taking the backseat until the platform and the online services are solid and proven from a market standpoint.
I still believe that if the Switch is successful the 3DS will not be around long, and there will be no "successor". There may be a different SKU released targeted at a portable only audience.