I'm curious on why a developer would want to pay for your solution to what seems like a problem that most can easily solve themselves with very little investment ? (Dynamic updates, pre-caching HTML/JS and presenting it locally for rendering).
The second component you offer on first blush is the JS wrapper / bridge to the native UI widgets which although might be nice to have most seasoned developers may find it a hard sell.
Cross platform would be compelling although the concern there being that the JS bridge is (obviously) iOS centric and may be difficult on other platforms ( Android / Blackberry / win 7 ).
Like I said, looks great I'm just curious what the value add would really be for a high volume application where cost to develop would be less than the pricing you offer (which is also of course recurring).