I found this on a different site, I have placed it here in the rumor section as this is just a rumor for now.This is a C/P from "Cyphris"

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Well by now most have seen the new Generation VS9000HD. A lot have asked what and why is there another tuner. Well on top of adding an internal fan to help keep the unit cool they have added a second satellite tuner. At present time this tuner will not work in conjunction with the first tuner (main). However it will still function. The first shipment was sent out without cables attached or included by mistake. The advantage of this added tuner is that in future firmware release it will allow the VS9000HD to be a true dual tuner HD PVR. Those who wish to use the add-on module will need to remove and replace this tuner. The Dual Tuner feature will also be available with the add-on module. This will make the VS9000HD the first true dual tuner HD PVR via firmware activation. Seems Viewsat is still on top of there game
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Take this for what it is worth for Now.