Opera Next is a separate installation of the Opera browser that lets you try our latest pre-release versions without affecting your main Opera installation. Look at the new release cycle, what and how Opera next will work with some basic FAQ’s.
Mozilla team is all set to release Firefox 4.0 Beta 11 by early next week. And it is extending its beta branch to Beta 12. Maybe Firefox 4 first Release Candidate(RC) will be delayed for few days.