As far as I understand it, EDGE is not a replacement unit of the VP line, it is a whole new concept.
The VP50Pro is still the flagship of DVDO scalers.
That being said Edge features few extras that seem realy interesting, 6 HDMI inputs, Audio dedicated HDMI out (I love that feature ! A must have for HD audio codec) and more easy to use.
On the other hand the VPs still show more flexibility and more options, price wise I feel that EDGE is a complementary unit in the DVDO range and it will not take the place of the VP50 or the VP50Pro. It strikes at another market, mostly LCD and plasma users, even though I am conviced it could also be a very good addition in a projector based home theater.