I'm excited just as much as everyone else, but MM seriously needs to put out more than 2 level packs. It's been over a year since LBP came out and I haven't touched it since the MGS pack. Hopefully the water addition will be a big enough change for people to make some really breathtaking levels.
There have been already a ton of really breathtaking levels. Also there have been two more level packs that included new materials and a new level already: the History and the Monster Pack.
Does this mean that if you want to play in a level with a new water mechanic, such as your friend (who has the water mechanic) inviting you to play one of their levels, you will have needed to have purchased this add-on?