So mine arrived. They are exactly as you described. Black/silver Dell unit with a Rio sticker plastered over the Dell icon. Both are in great shape physically. I have yet to fire them up, but hope to get started on that tonight. No HPNA card was included, as you note.
I called the Tiger people and spoke to an actual person before ordering. I asked two pointed questions, one of which was answered correctly, and the other wasn't.
(1) Does the unit include an HPNA card? "No," they said, and they were right.
(2a) Is the unit a refurbished, re-branded Dell, or an actual Rio? "It's a Rio," they said. I think they were simply looking at the same web ordering page I was. They were, of course, WRONG.
(2b) I insisted, and repeated my 2nd question. "Some folks on the web say this is a refurb/rebrand Dell unit. Is it Rio or Dell?" They answered "IT IS A RIO!" Wrong.
Doesn't matter much to me that this is a Dell. HW/SW is equivalent. I just wish Tiger would get their story straight.