Two questions rolled into one, if someone purchases my game, do they get access to all future updates?

Second part of the question, unless the answer to the above was No. If they purchase it for a lower price and the price increases, will they still get all future updates?

The answer to both questions is yes. :) The only exception would be if you added a download with a special price that's above what they paid.

Awesome that's what I thought, thanks for the confirmation :)