Fortune's curated selection of newsworthy tech stories from the last 24 hours. Sign up to get the newsletter delivered to you every day.
* After months of intense speculation, Apple (AAPL) and CEO Tim Cook announced the comparably-priced iPhone 4S for AT&T (T), Verizon (VZ) and Sprint (S), with the same dual-core processor featured in the iPad, an improved 8-megapixel camera, a major operating system update in iOS5, and Siri, a voice recognition "assistant" that makes calls, sends texts, and books calendar appointments among other things. Pre-orders begin October 7, with units available in-store Oct. 14. Watch video of the event here. (Apple)
* Salesforce.com (CRM) CEO Marc Benioff's appearance at Oracle OpenWorld was canceled, and Benioff blames Oracle CEO Larry Ellison. For its part, an Oracle (ORCL) spokesperson says the change was due to "overwhelming [event] attendance," however speculation points to a difference of company philosophies turning into a feud. Never one to admit defeat, Benioff has instead set up an alternate venue at a San Francisco restaurant to speak. (All Things D and Marc Benioff via Facebook)
* Cult of Android claims that Kindle Fire pre-sales are well, on fire, pointing to supposedly leaked screenshots of Amazon's (AMZN) internal inventory that show the color tablet is selling over 50,000 units a day. If that's the case, then the company already has another hit on its hands. (Cult of Android)
* Napster, which was just purchased by Rhapsody, is laying off 120 employees Dec. 16. (GigaOm)
* According to Twitter Chief Revenue Officer Adam Bain, the "information network" now has 1,600 advertisers. (TechCrunch)
* U.S. mobile ad spending is expected to top $1 billion for the first time this year. (eMarketer)
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