Mashable is reporting that Facebook’s long-awaited iPad app will be announced at Apple’s upcoming event, which will most likely occur on October 4th. In addition to the iPad app, Facebook will reportedly be launching a revamped iPhone app and new HTML 5 version of the mobile site.

You may remember that the iPad app was leaked earlier this year, but was subsequently removed from within the iPhone app. According to a post from former Facebook engineer Jeff Verkoeyen the app is ready, and Facebook is waiting to release it. An event alongside Apple seems somewhat logical, though the companies don’t have the greatest history with each other.

Perhaps most importantly, Apple is said to be integrating Facebook into its iOS 5 the way Twitter is now integrated. Facebook was integrated into prototype versions of iOS 4 but a falling out between Zuckerberg and Apple got them kicked off (screenshot below).

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Though Facebook wants to move to HTML 5 as their main platform, they will also be releasing a revamped iPhone app with speed improvements according to the report. If true, October 4th is sure to be a big day with the unveiling of the next iPhone, iOS 5, and now the Facebook iPad app.

A few more screenshots after the break:

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