If this is true it certainly sounds like the WB is already preparing to go ahead with a DS series.
But it doesn't appear to be true - at least not as of these rumors and reports. Not only haven't there been any reports of such a deal in the trades, but during this week's chat Kristin (of E! Online's Watch With Kristin) mentioned that "nothing has been decided" - and being the huge Angel fan that she is, she's been moving heaven and earth to report any good news about a possible future for the show.