Is it really confirmed that the March 1st patch added the rest of Jill/Shuma? Because I call bullshit.
That previous game hack was the complete deal, I think. The movesets were complete. The only doubt they had was that Jill's gun hyper was not complete, but it was. It's just that sucky and is not really meant to add a lot of damage to combos. Jill and Shuma are FULLY FEATURED in the Bradygames guide, I don't think you get much more complete than that.
On the missing voice clips, they were hacking the characters over other characters, it's quite possible everything didn't go completely as planned...
I'm fairly confident they had the entire first round of DLC complete before the game shipped. First batch of costumes, shadow mode, and the characters were all on disc. I believe it was either Niitsuma or Seth who said that a large majority of the entire dev team went on a fairly lengthy vacation once the game went gold. They weren't hard at work finishing up characters.
Although don't get me wrong, I don't fault them for it at all. I gladly bought the special edition and paid my five bucks for the costumes. It's DLC. The problems I have with it are independent of whether or not the stuff is on disc or off disc (I don't like using it in competitive games, where tournament organizers have to worry about all their setups having DLC purchased and loaded ahead of time. I'd take Super Street Fighter IV over having to download all that new content every day of the week).
I'm glad we're done with on-disc DLC though. I'm really looking forward to seeing new costumes and new characters, although I have a strong feeling that Frank West and Doctor Octopus will be the next round of characters.