This is going to be one of the biggest things to overcome for UAS enthusiasts wanting to convert their passion into a job they love: coming to understand the FAA. It is not simple by any means, but there is allot there that ends up making sense. Hopefully I can shed some light here with a mix of my knowledge, and my opinion. Please take this as what it is, internet stranger words, and that it is on any person who reads it to ensure the factual basis.
In reference to your question between recreational, private, and commercial just skip to the end, I'll answer it there.
First off, the FAA has to maintain the integrity of the skies as they are currently. In short, they aren't about to go and drastically change regulations to suit UASs (as you know 333 makes any small R/C aircraft a UAS now more or less). So it is going to be UASs that get raked over the coals to ensure safety. Furthermore all it takes is one bad incident to destroy a ton of progress for both the FAA and UAS operators. Caution is key. I will whip my dead horse, but a UAS operator risks money, EVERYONE in the skies in manned aircraft are risking their lives. Finally, the FAA already deals with a great deal of conflict in airspace as it is, for some reasons there are different frequencies for helicopters and airplanes when they are not operating in the area of airports or talking to air traffic control, and mid air collisions happen with things the way they are... near misses are even more prevalent. (seeandavoid dot org)
Regulations are going to be super stringent to start off with. Go with safe, make it work with safe, then figure out how to make it more practical. That is how, in my opinion, it is going to happen. I'm in favor of it. I want anyone that is going to be operating in the sky to know what it is like to be terrified by a bird, balloon, kite, and other aircraft. Then I know that they understand what it is like when I am out there flying. Don't forget we already get to deal with the geniuses and their lasers which give you the joy of literally flying blind. On the other hand I think that UASs give many a chance to explore what I feel is the greatest thing in the world: flying. I do think that the FAA will eventually establish certificate guidelines (licensing) for UASs that is not so costly, once they have a handle on things. I hope that when they do, they still require at least 1 solo flight in a fixed wing or rotor-craft. You can get more information on the different certificates out there, and how lightly restricted they are by checking reading 14 C.F.R. part 61.
Now, as far as what the FAA is taking to be recreational in contrast to commercial, let me help you out, because I have seen a good number of UAS hobbyists misinterpreting this, and it might end up costing you big. My warning is that right now the FAA is trying to get the word out that they control the skies and therefore they oversee and regulate UASs, but once they establish regulations I think there is going to be a great deal more interest by the FAA in violations. That being said, in my experience with the FAA as a pilot, and using current regulations as a loose outline, I would say the FAA is going to view UAS flights as being under one of three types of operations.
Recreational: Strictly for fun and leisure. You do not receive any type of compensation or benefit other than an enjoyable time with your UAS. If you post videos on the internet you do not receive any type of compensation from adds or traffic. Compensation is going to be the biggest separator here, if you receive any type of money or goods from flying a UAS or anything resulting from the flights (pictures, mapping, videos, sales, web traffic etc.) you WILL NOT be in this category. Currently no license required.
Incidental: The flight is in furtherance of your own business but the flight itself is not for compensation or hire, and the flight does not produce a product that is for compensation or hire. If you are a hobby store and you give demonstration flights, or film the product in operation, to better inform the buyer it would be incidental. This would be similar to a private pilot who owns a company, and has a meeting in another city, flying himself and his team to the meeting. He is not being compensated for the flight, and the flight is not for hire. This is the area that would be easiest to think that you are within, but you are not. If you make films with a UAS and give them away, but charge for the editing, you WOULD NOT be in this category. Currently the FAA is requiring pilots operating in this area to have a private pilot certificate at a minimum.
Commercial: The flight is for compensation or hire. You charge for the flight, or for a product produced by the flight, such as video, pictures, mapping, security, and so forth. Currently the FAA is requiring pilots operating in this area to have a commercial pilot certificate.
Hope this helps. [I know; I write novels... the curse of the long winded]
Oh, and flight school is fun.