Both have been out for a while, so it wouldn't surprise me. They just intro'd a new mid-level model, the V600, that has almost the same specs. That said, it could also be a way to spur sales, since the economy has effected all, large and small. If the specs of the V700 or V750 still meet your requirements, go for the price and save big time, rather than going for the latest and greatest, which will most likely be incremental improvements.
Nemo
P.S. - I'm considering one the three aforementioned models as well to replace my older Microtek flatbed and 120TF scanners.