Have you read any of the Revel thread?
Kevin Voecks posted comparison spins in the new format (much easier to read) comparing F208 and F228Be. See post #12227
Floyd Toole just posted some things on the Revel Forum about the DCC drivers and we all know how superior Be is for the tweeter. Fifth generation wave guide too (F208's are 4th generation), so they have improved that.
I'm thinking seriously about selling my F208s and upgrading to the F228Be's.
I was not too serious about doing it until I read more about how much better the new drivers and crossovers are. I'm pretty sure you can hear a difference if you are a serious listener, listen at levels that are appropriate for the musical style (like rock or classical) and listen for extended periods of time (sit and enjoy listening for 1/2 hour or more at a time).
Kevin Voecks says the differences are most noticeable under those circumstances. You will notice the smoothness of the treble region (lower distortion even though the Performa 3's are much better than most speakers way over their price) and effortlessness of the entire speaker, there is less power compression when playing at higher SPL's (i.e they stay more linear at higher levels). Many speakers (including F208s) compress in the upper midrange at high levels. F228's are nearly as good as Salon2's.
Kevin Voecks posted comparison spins in the new format (much easier to read) comparing F208 and F228Be.
My motto is "buy once, cry once". There is nothing new coming down the pipeline from Revel, the Be series is it (they just hit the streets) and there will be new models in the lineup, hopefully a center channel like the Performa3 C208.
Hope that helps!