I would welcome an APS-C Foveon SLR with good Live View, and I would go nuts over either a full frame Foveon SLR with Live View or any format Foveon SLR with Canon EF mount and Live View. Most of all, I would go bonkers over an upgrade of the current Sigma Photo Pro RAW converter to encompass some of the tools standard on Lightroom. The actual RAW conversion of the current SPP is fine, its monochrome is excellent, but can you believe - no cropping - no localized adjustments.
I love my Sigma DP Merrills 1, 2, 3 compact fixed-lens cameras - the files are really nice for landscape work, the subtlety of colors is wonderful. These cameras are definitely special-use cameras, due to the very poor performance at ISO greater than 400, and due to somewhat compromised dynamic range even compared to Canon sensors. My real dream is for the Foveon sensor to be brought to a 6 x 7 or 6 x 9 camera back compatible with view cameras with extensive movements. That would be a large format killer for landscape. It would also cost nearly as much as the Green Bazooka, with a good camera (Arca-Swiss for preference) and 3 good lenses attached.
As my other interests include wildlife photography, Canon SLRs are still going to be in my camera bag. Consider me a fangirl of the 400mm f/5.6L.