Well, 'tour' is putting it a bit strongly, as he's just doing a few dates in the South of England, but as one of the key pioneer thinkers on new forms of church, he should be worth catching. Details are on this page at the Fresh Expressions site, you'll need to scroll down a bit. HT Evangelism UK.
Blurb from the site:
Mike Frost is one of the world's leading thinkers about how the Church needs to change. He's the author of 'Exiles: living missionally in a post-Christian culture' www.facingthechallenge.org/exiles.php and co-author (with Alan Hirsch) of 'The Shaping of Things to Come: innovation and mission for the 21st-century church' www.facingthechallenge.org/hirsch.php.
Mike heads up the Centre for Evangelism and Global Mission at Morling College in Australia. More about Mike: www.facingthechallenge.org/mikefrost.php
The links take a few seconds to load, but they're good. I've read 'Shaping' and it's excellent. Some quotes from it here and here, for a flavour.