I read in one of the java ranch forum (SCBCD forum) that next version of scbcd will come after 1 year. I don't know about the manning exam kit, but it seems that it is enough to use HFEJB and EJB2.0 specs
In fact, we dont know when will the new version of SCBCD be released.
It is just an expectation on the new exam will come up for 1 year later at least.
I used Manning's SCWCD Exam Study Kit, and I believe each of which has its own advantages. HF is easy to read and understand, Manning's is written in a detail format, and provide as much information as it could.