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Yates, who is shooting finale Harry Potter and the Deathly Hallows, took the helm of the franchise from the fifth film onwards.
Referring to the finale of the series, which will be screened in two parts, he said: "You haven't seen anything yet."
The British director continued: "[Part one] is like a road movie, refugees being chased by all these people who want to kill them. It's quite intense. Then the final film is like this big opera, big epic, it's got more set pieces than any of the others."
Yates said that the last film involves "fights and dragons and battles", adding that it is "a real rollercoaster, but with a really oddly uplifting end".
Part One of Harry Potter and the Deathly Hallows is due out in 2010, with Part Two to follow in 2011.
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