Mobile Lowdown 8-28-11: Samsung; AT&T/T-Mobile/Verizon Isis; Nokia

A look at some of the big stories in mobile today:

» Samsung has announced LTE versions of the Galaxy II smartphone and 8.9-inch Tab tablet; the two will be debuted at the IFA trade show this week in Germany, but its plans for its 10.1-inch tablet release in Australia get delayed yet again. (via Samsung, Sydney Morning Herald)

» AT&T (NYSE: T), T-Mobile and Verizon want to invest as much as $100 million in the mobile payment JV Isis, says sources. (via Bloomberg)

» Sony is gearing up to offer a new e-reader, the PRS-T1, leaked on a Dutch website. (via MobileRead)

» Nokia has taken down its developer discussion board after it got hacked last week. (via Nokia)

» Nokia gets upgraded by analysts at RBC. (via WMPowerUser)

» HP‘s one-year plan — a damning look at all the wrong moves made by the company. (via WSJ)

» Quixey, which makes a search engine for apps, has raised $3.8 million in a Series A round led by U.S. Venture Partners and WI Harper Group with participation also from Webb Investment Network and existing investors Innovation Endeavors. (via Quixey)

» Leaked pictures of HTC‘s next generation of Windows phones. (via Pocket Lint)

» Samsung‘s legal team accidentally confirms the existence of a new generation of the Google/Nexus device, the Nexus Prime in a cease and desist letter to the blog (via