I had asked the question about Sound Waves over at avs and someone else finally "confirmed" this, but it appears they have or are in the process of going out of business (???).
As for DVRs from TW, there's good news and there's bad news:
1) They have DVRs available. I was forwarded the following e-mail:
Great News! We have just received some great shipments of DVR's! Please begin selling at full speed on the phones, sales centers and in the field!!!!!!!!!!!!!!
DO NOT PUT PHONE ORDERS ON A WAITLIST! SCHEDULE THE ORDER IMMEDIATELY FOR EQUIPMENT MAIL!
2) TW-WOH had a major mainframe computer crash and apparently they're still "recovering" from it. If you call, you will be on hold for a long time.