I'm 50% for JavaOne this year; a BOF session for Tapestry ("The Component Edge: Creating and Using Components with Tapestry") was accepted, but a more introductory Tapestry session, like last year's, got passed over. I guess by JavaOne 2007 I'll be able to talk about Tapestry 5 :-).
As a BOF, there will be much more opportunity for interaction with the audience, and room for others to discuss what they are doing with Tapestry, which I think is exciting. No word on scheduling yet, beyond the May 16 - 19th for the overall conference. I probably won't stay for more than a day or two this year, as I have to be in London on the 22nd.