The Avengers: Age of Ultron's concept art revealed what looked to be a Hulkbuster armour. Whether or not Tony Stark will be inside it, if indeed it actually appears in that movie, remains to be seen (Ultron could be controlling it using technopathy), but it's certainly suggestive of that fact that some cool armours from the comics are set to appear in the movies. As well as the Hulkbuster, Tony Stark has created armours to deal with a rogue Thor (the Thorbuster) and Thanos (the Thanosbuster) - the latter of which seems like it could come in handy in future movies, given that the Mad Titan is set to appear - as well as many other awesome armours that are yet to appear on screen. If indeed the Hulkbuster does make an appearance in Age of Ultron, it would certainly suggest that Tony Stark is specifically building armours to deal with potential threats and, simply put, that could mean that an army of such armours could appear in the next Iron Man movie.
