THERE IS A SOLUTION! Worked for me at least...
1) Delete the WebClient Service Book
2) Connect to Desktop and Clear "Folders" database
3) You should see some data activity as BES folders are recreated OTA
4) You should now be able to file your BES mail in BES folders
5) File a few emails to make sure it's working
6) Go to BWC and resend service book
7) You'll get the service book AND....
ALL you'll see are BES folders! NO BWC folders which is perfect since I never used them. I've had this for a few days and multiple resets (removing apps) haven't changed anything.
When I click on a BES email I have the option to "File." When I click on a BWC email, there's no "File" option.
Works great for me until they fix it!