According to German website Macerkopf.de, Apple will hold a media event at the corporate headquarters in Cupertino to give a sneak peek of the upcoming major version of their mobile operating system, iOS 5, and the new MobileMe. The website reports [Google Translation] invitations will be sent out in the second week of April, and admittedly this rumor corroborates several blogs’ speculation that Apple wanted to save iOS 5 for a proper dedicated event instead of a quick preview at the iPad 2 event on March 2.

Previous rumors suggested iOS 5 would get a completely new notification system, deeper integration with the cloud (thanks to the data center in North Carolina) and several location-based features. As for design changes, patents Apple had been awarded showed new scrollable menus and other interface styles. MobileMe is also widely believed to come with a new, free version for all customers with cloud backup support for iTunes and other media. Steve Jobs once said in an email to a customer that MobileMe would get “a lot better” in 2011.

Code references found in early iOS 4.3 betas pointed to a new feature in development called MediaStream for photos and videos. In the past months speculation also indicated Apple was working on a smaller version of the iPhone strongly based on cloud services, although the rumor has been debunked from various sources since then.

There is no doubt, however, that Apple will prefer holding a single event focused on iOS 5 rather than including the preview in other product announcements. With an iOS 5 preview and beta likely to ship in April, developers will have plenty of time to update their applications for a possible launch of the new OS at the WWDC in June alongside the new iPhone.