It's a bit too early for an understanding of the implications of the Point Rosee site. It hasn't even been confirmed to be Norse yet and nothing has been formally published on the matter.

If it is a Norse site, that alone isn't shocking. The Vinland sagas talk about 2-3 Norse encampments in Vinland (someone who is more familiar with the sagas themselves can hopefully give the specific number). So finding additional sites in Newfoundland was always a reasonable possibility.

If Point Rosee is Norse, it was probably only inhabited briefly, just like L'Anse aux Meadows and the handful of known Norse encampments on Baffin Island (Nanook / the Tanfield Valley site being the best known). If it turns out to be Norse and it was inhabited for a significant amount of time, that would be a departure from our current understanding of Norse interaction in the area.

If the site isn't Norse but something else, well, then we'll have to wait and see.

As of yet, none.

As I understand the news, they have not really done any research, but merely located a site that is considered to be very likely to be of Norse origin. We already know from archeology and written sources that the Norse were aware of these lands, and that they explored them. Locating an extra side beyond L´anse Meadow is not really giving us any new information, although it may well do so once they start digging around.

We do not really know if the Norse ever did more than exporing the Northeastern coast of America shortly after they discovered it. Anything that suggests more activity would have implications. That could for example be a different timing, remains of domestic animals (suggesting attempts to colonize), and signs of trade or cultural exchanges with indians would be huge finds.

For context, here is a CBC article on the new site.

L'Anse aux Meadows, the only previously confirmed Viking settlement in North America (outside of Greenland), is located at the northernmost tip of Newfoundland. The new site is at Point Rosee, roughly 600 km south of L'Anse aux Meadows, in the southwest of Newfoundland.