iPad Pro

Yes, the iPad Pro, iPhone 6s and iPhone 6s Plus all feature the option for an "Always-on Siri." The feature is the same as the "Hey Siri" option found in iOS 8, but your device does not need to be connected to a power source for it to work. Only devices with Apple's A9 chip support Always-on Siri. This means the iPad mini 4 and iPad Air 2 need to be connected to a power source for "Hey Siri" to work. You can lear how to enable "Hey Siri" in iOS 9 here.

No, Apple does not offer the iPad Pro as a 32GB cellular model. The 12.9-inch iPad is only available as a 128GB Wi-Fi + cellular model for $1079. A 32GB WiFi-only model is available for $799.

You can purchase the iPad Pro on Apple.com, at Apple retail locations and at authorized Apple resellers. Here are all the available models:

The iPad Pro is Apple's largest iOS devices. It sports a 12.9-inch display and it is 8.68 inches (220.6 mm) thick. The WiFi-only model weighs 1.57 pounds (713 grams) and the cellular version weighs 1.59 pounds (723 grams). The iPad Air 2 WiFi-only model weighs 0.96 pounds (437 grams), as a comparison.

While Apple hasn't officially announced how much RAM is included with the iPad Pro, a press release issued by Adobe mentioned that that the 12.9-inch tablet is packed with 4GB.

Update: The press release has been edited by Adobe, but the consensus remains that the iPad Pro ships with 4GB of RAM.

No, the iPad Pro does not have 3D Touch. Only the iPhone 6s and iPhone 6s Plus have 3D Touch displays. Touch 3D is a new feature that allows users to view content based on how hard they press their displays. Apple normally rolls out new technology to its iPhone lineup before bringing it to their iPads. The iPad Air 3 may ship with 3D Touch when it is launched in 2016.

The iPad Pro is equipped with a built-in 38.5-watt-hour rechargeable lithium-polymer battery with up to 10 hours of usage while using Wi-Fi. This includes using the internet, watching videos or listening to music. The battery has up to 9 hours of life while using a cellular connection.

Yes, the 12.9-inch iPad Pro is equipped with four stereo speakers. This gives the Pro three times the audio volume of the iPad Air 2.