PopCap has today announced Plants vs Zombies 2: It's About Time, the sequel to its massively popular tower defense game that continues to have us hooked, despite being more than two years old.

Plants vs. Zombies 2 will be previewed for the first time at E3 next week, and will be released on exclusively on the iOS App Store for iPhone, iPad and iPod touch on 18 July.

PopCap says that Plants vs. Zombies 2 will be free to download, bringing with it many new levels, new plants and new zombies. Upgrades and in-game items will be available to buy as in-app purchases, but players can face every zombie and access every level without paying a penny.

"Designed from the ground up as a live service, the ever-expanding universe of Plants vs. Zombies 2 continues the epic struggle of plants defending your brainz against zombies from your backyard through the vast reaches of time, both past and future," reads PopCap's press release. "New worlds with new levels, plants, zombies and new ways to play will be released on an ongoing basis. Leveraging the touch interface of Apple’s popular mobile devices, Plants vs. Zombies 2 includes all-new touch-screen power-ups that enable players to “break the fourth wall” and interact with zombies directly, as well as via plant defenses."

“It’s about time!” said Allen Murray, Senior Producer for Plants vs. Zombies 2. “We’re confident that players will see the love and attention we’ve put into this game. We’ve created wild new ways to experience the plants and zombies you know and love as well as packing the game with tons of completely new content, and we’re still hard at work coming up with even more cool stuff that will keep Plants vs. Zombies 2 fresh and evolving in the months and years following launch.”

18 July is more than a month away, but if you, like us, can't wait to find out more, you can watch the official trailer below: