I talked to David there the other day...they are still out of production, but hoping to finalize their move to another facility, and get back in production at some point. If you're interested in them for the RV-10, I sugggest contacting him (the phone # on the web site seems to be the best way) and encouraging him.
I asked about what could be done ahead of time even without the hard point kit, and he sent me the installation instructions, which match other information I have been given) and we talked about some items that would be easier to do now rather than later. In particular, there are several rivets that need to be drilled out of the forward and aft spar center sections and replaced with bolts. Way easier to do before the fuselage is assembled!