Cuba is NOT about to make any big changes. At least not unless the man who has been busy trying to destroy this country by Executive Action decides to prop up the Communist Government at our expense. The idea that Cuba has been suffering from an isolationist policy imposed by the United States is bogus. We were (somewhat) cut off from Cuba by our government, but we are only one country. Canada and most of the rest of the world has still been trading with them. Sure, Cubans drive around old American cars from the 50's, but they keep them running and keep fueling them with imported gasoline. Other countries would be glad to sell them newer cars, it is just that when you have a communist mindset keeping the economy depressed, no one has the money to buy new modern expensive cars.
Sure, they might sell Americans some cigars, although there has been a supply of them coming in through Canada already. They will not be selling us sugar, but not because of any real barrier. Rather because of a completely artificial barrier, Cubans who moved to Florida when Castro took power have gotten laws in place that impose such high tariffs on imported sugar that we can't import it, and we have higher prices on Sugar than the rest of the world, with all of that money going into the pockets of a few politically powerful Cubans in America who grow sugar and trickling down to the politicians they buy to keep the system in place.
Cuba is going to see a little bump in tourism, at least while the novelty is still there, but it will not be that much or make a big impact, they already have tourism from the rest of the world and from Americans going there through Canada who show their American passports and ask that they not be stamped to avoid problems back home. We will still over pay for sugar compared to the rest of the world and have tariffs that keep us from importing it from Cuba.