This firmware adds to the features introduced in 308. Specifically:
1. It will be possible to display absolute wind speed on the iBike screen. You'll be able to tell if there are head winds and tail winds and, if so, their magnitude IN THE DIRECTION IN WHICH YOU ARE TRAVELING. The option to show absolute wind speed is selectable in Setup (ABS WND YES/NO).
WARNING: YOU MAY SEE UNEXPECTED NUMBERS FOR ABSOLUTE WIND SPEED WHENEVER YOU ARE DRAFTING, OR WHENEVER THE WIND IS HITTING YOU AT AN ANGLE. WE HOPE THIS COOL FEATURE WILL HELP YOU BETTER UNDERSTAND HOW WIND AFFECTS CYCLING PERFORMANCE. WE ALSO HOPE IT DOES NOT CREATE TECH SUPPORT NIGHTMARES.
2. We have reordered the setup menu to be much more logical. For first-time setup, simply clicking the up arrow after entering each quantity will take you to the appropriate next screen. Once the iBike is calibrated, when you re-enter setup you'll skip all the one-time screens and go directly to your most recently used screen (weight, tilt, offset). Commonly used screens are grouped very closely together.
3. If you use the Fit Train feature, we have greatly simplified its setup. The FIT CFG screen of 308 no longer exists. Instead, when you press-hold the right arrow, you will go to the fitness training interval set you selected most recently. For example, if you previously selected a cardio workout, when you enter FIT TRAIN the word "cardo" will appear. If you want to select a different kind of interval set, use the left/right arrows to scroll to other interval set options (fat, cardo, strgh, usr, iB3). If the interval set you've selected has differing degrees of difficulty, use the top/bottom arrows to select your degree of difficulty. Once you've made your selection of desired interval set type and difficulty, to start the interval set, press the center button. The appropriate interval screen will appear and you can begin your workout by pressing the center button. To exit INT TRAIN, press-hold the right arrow. NOTE: IF YOU ARE IN MOTION (i.e. Bike speed is not zero) AND YOU PRESS-HOLD THE RIGHT ARROW, YOU WILL GO DIRECTLY TO THE INTERVAL SET, SKIPPING THE INTERVAL SET SELECTION SCREENS. This last feature is particularly handy if you are using the USR Interval feature.
4. When using Fit Train Interval sets, the first interval shown will start at the FINAL interval number of the entire set. Then, each time you finish the current interval and go to the next interval in the set, the interval number will DECREASE by one. For example, if you are doing a pre-programmed Cardio interval set, and for your fitness level and difficulty there are 7 total intervals in the set, when you begin your cardio workout the FIRST interval you do will be #7; the second interval #6, etc.
This way, you'll know the number of total intervals in your workout, and the number of intervals remaining before the set finishes.
5. For fitness interval sets, each interval now has a lap marker placed automatically at the end of each interval. You'll now be able to easily see your intervals in the iB3 software.
6. When you do a Fitness Test, at the end of the test your W/KG result will be used to calculate an estimate of your FTP, according to the formula FTP = 0.95 * WKG * weight (kg). You will see your estimated FTP on your FTP CFG screen. NOTE: if you wish to use a different number for your FTP, you can override the result from the fitness test by entering your FTP manually.
7. Your Fitness Test result will now be stored in memory, so you won't lose the fitness test result if you remove your iBike battery.

8. Fixed a bug that caused the LCD screen to fade a bit when the iBike was set to metric mode.
To quote John Hodgman (aka PC):
THAT IS ALL