The 7/8-inchers have resistive screens and 4000mAh batteries, and the 10-inchers have capacitive screens and 4800mAh batteries (should have long runtimes).
All have 1Ghz Samsung S5PV210 Cortex A8 CPU's.
For memory, all list only "Flash/Built-in 4GB/Expandable up to 32GB", so that must be internal storage (wonder how it "expands"...), but no RAM info.
Looks as though they are trying to take on Archos (all list HDMI 1080p/720p output).
I did not see anything about availability date(s), retailers, or pricing, but I would guess the current 7015 and 7005 models will be showing more discounts (Walgreen's lists the 7015 for $150 minus a penny in this week's Sunday circular).