He would need to have many more spots in order to be considered a real dalmation, but he certainly has potential :)
One of my babies started out with just a couple spots, but by four months was at about 45 spots.
You just need to wait through the "ugly duckling" faze(until they're about 4 months old) until it starts to get it's mature colours in slowly. You should be able to tell by 4 months if it's a real dal.
Hope that helped. :)