The developers said that this card was changed in the final stage of the design process, to keep it in line with the "class identity" announcement. Before it was changed it was probably a board clear, like the other plagues, but the Blizzard overlords wouldn't allow Rogue to be able to clear more than one minion at a time. This card is probably gonna end up like Dr. Boom's Scheme, never seeing any play because of a stupid last minute decision to change the card from what it was originally supposed to be.
No gold saved yet, since I've been concentrating on obtaining all of the RoS legendaries (mission accomplished as of a week ago).
I will most likely get the pre-order though and probably start saving gold from now as well.