We have already discussed the new answer-from-the-banner ability.
Another new feature is Voice-messaging to other iMessage users. In other words, this feature is an iOS to iOS ability only. If anyone learns that it works from iPhone to Android, please let me know.
Notice that next to the typing space, the “send” has been replaced by a little microphone.
Here is how to send a VOICE message in iOS8:
When you get ready to compose your message, instead of typing, put your finger on the microphone to the right of the message space.
As you press the icon (keep your finger on it) you can record your message.
When you are done, lift your finger up to listen to the recording. To send it, tap on the arrow. To delete it, tap on the X.
If you want to use this feature, I suggest you practice a little bit. It sends quickly and if you make an error, you can’t get it back…… so use with caution. 😯 🙂