That sounds great, but makes no sense. Why make 16 DLCs and give them away for free? Wouldn't it be better just to include them in your game and release your epic all at once?
If it's due to time, and they want to develop the story, characters, environments, etc. after release, wow. That really would be something!
Quoting from the CEO's open letter on the subject:
"As gamers, we nowadays have to hold on tight to our wallets, as surprisingly right after release, lots of tiny pieces of tempting content materialize with a steep price tag attached. Haven't we just paid a lot of cash for a brand new game? As CD PROJEKT RED, we strongly believe this is not the way it should work and, with The Witcher 3: Wild Hunt, we have decided to do it differently. Cutting to the chase, everyone who buys Wild Hunt will receive 16 specially prepared DLCs absolutely for free, regardless of platform."
Personally I think console owners may be a bit more sensitive to DLC pricing given they probably deal with it more often on games like CoD, Destiny, etc than maybe pc and mac owners since most pc/mac games don't really carry much DLC. So for console owners this is probably a great incentive and value from the start. No need to wait for game of the a year edition etc.
As far as timeline CD Projekt Red has already moved the release date back from 2014 to 2015 to ensure a smooth launch so all the DLC is likely stuff they'll be working on and adding afterwards to keep buzz up on the game, giving it a longer life. But more importantly they probably just aspire to have their game and company highly respected amongst the competition and realize (long term) it's not in their interest to squeeze money from players at every possible opportunity (Blizzard, EA) or hamstring a game experience with junky DRM (Uplay, Ubisoft).
Remember this game is bigger than Skyrim, has a 50hr main storyline with some 30+ endings, and over 100hrs of gameplay so 16DLCs on top of that and you start to see the massive ambition the Witcher 3 is carrying from the start.