Research in Motion&'s BlackBerry PlayBook tablet will hit store shelves on April 10, multiple sources tell the mobile site Boy Genius Report.

That date falls in line with RIM&'s plan to release the tablet some time in the first quarter. BGR says that the OS will be finalized on March 31, but users will be prompted to install an update as soon as they boot up the device.

I expect we&'ll hear even more leaked information on the PlayBook soon, as it would be a good way for RIM to subvert the iPad insanity brought on by today&'s iPad 2 launch event.

Also in PlayBook news, HP apparently isn&'t taking too kindly to the tablet&'s slick multitasking interface. Jon Oakes, HP&'s director of product marketing for the WebOS-powered TouchPad tablet, apparently considers the PlayBook&'s interface a WebOS imitator.

Speaking to Laptop Mag, Oakes said:

From what wea4‚¬a4„ve seen in the market, there are some uncanny similarities. Ita4‚¬a4„s a fast innovation cycle and a fast imitation cycle in this market, so we just know that we have the creative engine here to continue to build on what we have, and wea4‚¬a4„ll keep innovating, wea4‚¬a4„ll keep honing and those guys hopefully will continue to see the value in it and keep following us by about a year.

RIM, to its credit, responded by saying that the PlayBook&'s interface is just the result of good design. RIM senior vice president for business and platform marketing Jeff McDowell likened the situation to how competing cars end up looking similar after going through a wind tunnel. He also said that QNX, the software company that RIM bought last year and whose OS powers the PlayBook, may have had that interface in mind before they started working with RIM &8212' which shifts any blame of design imitation from RIM to QNX.

Next Story: Spoon wants to scoop up gamers with a new cloud gaming service Previous Story: Apple expected to ship 40M iPads in 2011, convincing iPad 2 mockup appears

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Tags: BlackBerry PlayBook, tablets, TouchPad, webOS

Companies: HP, QNX, RIM

People: Jeff McDowell, Jon Oakes

Tags: BlackBerry PlayBook, tablets, TouchPad, webOS

Companies: HP, QNX, RIM

People: Jeff McDowell, Jon Oakes

Devindra Hardawar is VentureBeat's lead mobile writer and East Coast correspondent. He studied philosophy at Amherst College, worked in IT support for several years, and has been writing about technology since 2004. He now lives in Brooklyn, New York. You can reach him at devindra@venturebeat.com (all story pitches should also be sent to tips@venturebeat.com), and on Twitter at @Devindra.

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