1. Now that JBossAS4.2 has gone GA, we will support it soon enough on the trunk. However fro ESB4.2MR2 please use AS 4.0.5.
2. Yeah it looks like something is wrong in the soap transport. It was tested AS 4.0.5 running ESB 4.2 MR2. Maybe you can clean and start from a fresh install? Let us know. Tom Cunningham is currently rewoking this a bit, so he might be able to lend you a hand if you don't get it to work.
There's been quite a few trailblazer changes that have gone in the past couple days that I think should fix your issues. If you want, you should be able to get them from SVN:
svn co http://anonsvn.labs.jboss.com/labs/jbossesb/trunk
Please note that there have been changes in the trunk that are incompatible with MR2, so you can't just download the trailblazer and stick it into MR2.