DLC is in!!! Will be included free as it becomes available on new consoles if you already purchased.
The problem is the system you have it on. I was a 360 player last gen. All my music is on that. I'm never buying an Xbone, and I don't think they'll do some sort of cross transfer thing. My idea I had was like a website thing connected to your gamertags, no matter the platform. I input my 360 gamertag, it registers what music I have, it then unlocks it for transfer, and then inputting what would be my PS4 gamertag, and it transfers it that way, but I think this is completely farfetched lol
Also, they are looking at a way to make your old instruments usable on it. My guess, through a cord or USB wireless receiver or something. Handy, but again, 360 gear I can't use lol
I do like what they are talking about with the game, how they are stripping it back down and looking to give it more of its unique identity. Gone are pro modes and the keyboard. Pretty stoked for the game. Gonna pop in Rock band 3 tonight I think lol
http://www.destructoid.com/rock-band-4-is-coming-and-it-s-bringing-the-party-back-288538.phtml