Last Thursday, Steve Jobs gave a developer preview of iPhone OS 4.0. The updated mobile operating system has over 100 new features, but only 7 were given the limelight in Jobs’ presentation. That leaves the possibility of iChat being one of those 100 features quite high, and with the recent findings made within the iPhone OS 4.0 SDK, rumors are certainly pointing to the Apple instant messaging application coming to the iPhone platform in the near future.

Can you remember back at the beginning of the year when we heard the news that Apple had acquired the mobile advertisement company, Quattro Wireless? Well, the rumor mill is heating up once again, as “sources familiar with the company’s plans” have stated that Apple plans to unveil a mobile advertising system for the iPhone OS during tomorrow’s media event.

So as we’ve just found out, Apple has sent out invites for an iPhone OS 4.0 preview event later this week. Notice that the artwork on the invitations reads, “iPhone OS,” so I’m not expecting any hardware announcements from this event. But 4.0 is the next big jump for the iPhone platform, so what could we be laying our eyes on this Thursday?

Each year, Apple holds an event for developers of Mac OS X and the iPhone OS. This event—The World Wide Developers Conference (WWDC)—is held in the summer months, and Apple have set the dates for this year’s conference as 8th – 12th June 2009. A lot of the event means nothing to a lot of people, unless you’re a part-time coder or have an interest in developing applications for Apple systems. But there’s also a presentation that the rest of the world looks in for.