Where can I find a complete list of all current features / objects?
Your best bet would be going through the manual here: https://www.scirra.com/manual/1/construct-2
When is Construct 3 due for release...?
There is no date known publicly, so I'd say what everybody says: Don't expect it any time soon. If you feel like you can use this software for good and enjoy working with it, then go for the personal license. As Usman Haq said before, you'll get a discount to upgrade to Construct 3 later on.