With the official announcement of the iPhone 6s today, not much has changed in terms of size. Although their new 7000 series aluminum body is an upgrade, there's only a .2mm difference in thickness, .2mm in length, and .1mm in width. This shouldn't dramatically impact the fit of majority of standard cases already available for the iPhone 6 — the exception being tight-fitting covers such as waterproof cases. So, keep it in mind that you may not need to snag a new case if you're upgrading to the 6s come September 25!