I don't get it. What is new here? The Dwolla seizure has been known for a while. Have you been living in a cave for the last three months?
No. What Karpeles is confirming is that the USD withdraws are being halted by the US gov. NOT due to problems with Mt.Gox's banking connections, which they have used as an excuse the last 2 months. This essentially means that USD withdraws will not resume for quite some time, if ever.
This is pure speculation. From the context I assumed, and still assume, he was referring to the Dwolla case which significantly increased the load on USD bank wires. Why don't you ask him yourself? He is frequently active and answering questions in #mtgox on freenode. I'm sure he would have been there a lot more if it hadn't been for the zombies nagging about scamcoins they want on MtGox whenever he types something. It is early morning in Japan now. He'll be there soon.