Before the event:
SPOILER ALERT: Almost everything about this event is leaked!
1. iPhone 6S ( and 6S Plus). This one is a no brainier. We are expected to see the same design, although the 6S will be slightly thicker (and larger) because of Force Touch as well as the tougher 7000 series Aluminium (#BendgateNoMore). The biggest new feature is definitely going to be Force Touch -- pressure sensitive touch that'll add a new layer of control to the phone. We have already seen Force touch being implemented on the Watch as well as the MacBook Pro Retina lineup. Finally, we will probably also see a 'Rose Gold' coloured iPhone 6S (and 6S Plus). Sadly, it seems the base model of this iPhone will remain 16 gigs.
2. Apple TV: The idea behind "Siri, give me a hint" is probably from the fact that the 4th gen TV will have Siri control. The TV is said to hold centerstage this time, with an all new design, faster processor, an all new remote that'll have a touchpad for navigation and of course, a mic for Siri. There might also be an AppStore for TV, so people can download and play games right on their Apple TV. Let's wait and see.
3. The iPad Pro. Wait... what is the iPad Pro? Its a 12.9" iPad running iOS 9, incorporating a stylus and made for serious large touchscreen lovers. It will be so powerful that it'll run 2 (maybe more) iPad apps side by side and incorporate the best of iOS 9 features. It is going to be a beast of a tablet, and we should just wait and watch out for this one. (I have no words for this one. Who needs a tablet that has 12" of screen estate? Only Apple knows).
iPad events are usually separate from iPhone events, but this might be the first time everything new comes out in one go. We will see tomorrow!
Other than these products, we might see a the 21" iMac getting a 4K upgrade, the Mac lineup getting the Intel Skylake processors and a new, thinner iPad Mini 4.
------- Spoilers over :P --------
Okay, that said, the event is taking place at the Bill Graham Civic Auditorium, San Francisco. This event is going to be so big, Apple thinks it needs the 7000 seat capacity auditorium. Apple has approached this event differently this time: it has enabled more people to watch it live by opening it up to Windows 10 Microsoft Edge browser users. Not just that, there will be YouTube techies at the event too, for the first time ever (#TeamCrispy). It just shows how much more publicity Apple wants to make with its new products.
The event will be held at 10 a.m. PDT, or 10:30 p.m. IST tomorrow (9th September). Use the following twitter feed to get all the updates live.
I'll see you on the other side of the event with my notes and conclusions.