Next week is LinuxTag and I'll be there, of course. I'll host part of OscomTag on Wednesday afternoon and we'll certainly also be there at the LAMP-Area on Thursday and maybe Friday.
If you have questions about BxCMS, Bitflux Editor or general questions about PHP (and XML), that's your chance to get the answers and demos in person. Besides meeting a whole bunch of the PHP and MySQL creme-de-la-creme :)
If you have specific questions already now and would like to make an appointment there, just drop me a note and I'll get in contact with you.
Hopefully see you there.