There is a lot to tell you about Beta 4. This is the last pit stop before the release candidate, and it's now feature-complete. Let's dig in!

• Better auto-connect - Your user will only see the connection UI once. It will auto-connect thereafter. If that's one too many times, there's a slick new way to watch for new pens and handle connecting in the background. Check out the pogoManager:didDiscoverNewPen:withName: delegate example in the demo project.
• Changes to delegate method names - If you're opting in to any delegate methods, update to the new standardized naming convention. Also note new delegate method pogoManager:didChangePressureWithoutMoving:forPen:.
• Fun new proximity detector - You really don't need to do this, but hey why not? Call startPenLocatorWithAudio: and have a little fun.
• New pressure profiles - It's optional, but you can specify how a T1PogoPen reacts to pressure with setPressureResponse:. Choices are T1PogoPenPressureResponseLinear (default), T1PogoPenPressureResponseLight, and T1PogoPenPressureResponseHeavy.
• Optimized pressure range - This release improves pressure range for pens with firmware version 0.5.0 or later. If your pen is 0.4.0 or earlier, it will still work for testing purposes, but may not be able to reach a very low or very high pressure output. Also the pressure output may occasionally stutter. You do get mad early adopter cred, though. On the other hand, if you're reading this, early adopting may not seem so unusual :)
• General Xcode project info - The file organization has shifted around a little. It's probably best to remove the old library, and re-add this one. GameKit.framework is no longer necessary, but you'll need to add AVFoundation.framework. T1PogoDelegate was broken out to a separate header file because it got too awesome. Be sure to include that if you use it.
• iOS 6 - We can't wait for iOS 6. Nearly instant connections, better battery life, faster performance, and easy sharing of the pen between apps. The iOS 6 beta 1 isn't quite ready for prime-time yet, so keep working with the latest 5.x if you can. Our next release will have full support for 6.
• Project Update - We're happy to say the design has passed a large regulatory hurdle, and is waiting for official certification. Things are kicking into gear, and we'll be contacting each of you with our launch plans.

The updated SDK and demo project are available here.