Another important point: Riot seems to follow a walled garden ecosystem in terms of skins. You can buy them from Riot shop only.. you can´t sell them or trade them with other players. One of the biggest things that made csgo as successful as it is was the skin trading side of the game. I know, it´s a bit retarded and there are people who don´t care about it, but it is what it is. It it was not for the skin market, csgo would probably be dead by now.
At this time, the availability of different skins/characters in Project A to purchase (or unlock by playing, as it hapens with LOL) hasn´t been confirmed, but I´m assuming it will happen. I don´t know the impact this might have in the csgo vs Project A coming war though, because the same happens in the DOTA vs LOL battle and DOTA is rekted by LOL everyday in terms of player numbers.