We don't have a release date or feature list as of yet, eCart 6 is still in the early planning and development stages.
The upgrade price is not temporary though, if you own eCart5, you will be able to purchase the eCart 6 upgrade for $99.99
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These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.