Apple also announced that watchOS 4, the next version of its smartwatch platform, will be arriving in September.
The HomePod is priced at $349 and will be available in US, UK and Australia in December.
Created to work with an Apple Music subscription for access to over 40 million songs, "HomePod" provides deep knowledge of personal music preferences and tastes and helps users discover new music.
Siri has had a substantial head start on other virtual assistants since its launch in 2011 but hasn't really garnered the attention paid to newer competitors like Amazon's Alexa and Google Assistant.
In addition, Cook said Apple, headquartered in Cupertino, Northern California, now has 16 million registered software developers worldwide for its consumer electronics, including smartphone known as iPhone, and 3 million of them were added past year.
He announced that Amazon's video app will come to Apple's TV streaming box later this year. It includes new features for watchfaces, such as a new Siri-based watchface.
The speaker has the "power to rock the house", according to Schiller, and the aim is to make HomePod a potent assistant for news, messages, weather, traffic, home controls and more.
Other new watchfaces include a kaleidoscope and new characters such as Woody, Jesse, and Buzz from the Toy Story movie franchise.
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Apple said that watch wearers will be able to link their devices with the gym equipment through NFC.
Apple said that it is the fastest browser ever with features like autoplay blocking, intelligent tracking prevention that uses machine learning to block irritating content.
But Apple is late to the game on VR.
Before making the announcements, Cook said that this year "it is going to be the best and biggest WWDC ever".
The 10.5-inch iPad Pro model starts at $869 CAD for a model with 64GB of memory, $999 for 256GB or $1,259 for 512GB. Two benefits worth mentioning: drag and drop support and a new Files app, both of which would make a tablet such as the iPad Pro that much more like a Mac.
Whenever the phone is connected to a auto using either Bluetooth or a cable, or if the vehicle is moving, the phone will withhold any notifications for things like text messages or news updates.
The iMac Pro sports a 27-inch Retina 4K display and powered by a 18-core Xeon processor with 128GB RAM and up to 4TB SSD.
Just under 7 inches tall, HomePod represents years of hardware and software innovation at Apple, including spatial awareness that allows HomePod to sense its location in a room and automatically adjust the audio to deliver a great music experience, a large, Apple-designed woofer and a custom array of seven beam-forming tweeters. But global travelers will likely appreciate the fact that Siri will be able to translate English words and phrases into Chinese, French, German and Spanish.