Exactly as previewed by Amazon’s Canadian and Chinese sites, on Wednesday morning the company officially unveiled their new Kindle Oasis ereader — premium priced, starting at $290 with ads. (Removing ads costs another $20; adding 3G is another $70.) Per our report yesterday, the new model is thinner and lighter than ever, as long as you are not counting the charging cover, which almost doubles the weight. That self-charging cover is actually “a new dual-battery system” that charges the reader once it is connected to the cover. “The battery in the cover uses a custom cell architecture that optimizes power and energy […]