Earlier today Apple released the fifth version of iOS 5 beta for developers. The new build offers a hearing aid mode to enhance accessibility, but otherwise has no notable new features. It does addresses a number of quirks from previous releases.
Tech blog BGR shares the full change log for iOS 5 beta 5.
If you're a developer with access, the over-the-air update from iOS5 beta 4 to beta 5 is 128MB.
Apple Releases iOS 5 Beta 5 [PCMag]