Well... last I heard - same as you.. was that FPSCx10 was written in DarkBasic x10 in house version... not released etc etc. So... The way I see it... they are staying hush about it and are probably listening to our posts and working hard to make it come to market "ready" (doc's, low bugs, Q/A etc.)
Also, there was mention of making one language two api.. that might be tricky.. but if I was them, I would at a minimum figure out a "port" path for all the products to their dx10 equivalents.. from what they learned doing it themself.. so this way they can entice people to upgrade as they can leverage their current work if they do x,y,z...
I mean, if I was them.... I would at least try to keep all my products centered around technology to be based on one code base where possible easing bug fixes and rollouts.. so they can for example... fix a bug that effects all the products and that would make life easier for the developers getting those fixes out there as the could kill multiple birds with each proverbial stone.
Sounds good in theory.. difficult in practice. I have to say that I'm riding things out with DarkGDK.. I bought it before it was released as free-to-use license (non-commercial) so I had a head start in some ways.. and I'm quite vested now and pleased. I think there will be a DirectX10 product... and I think TGC will do what they can so myself and others can make the transition without starting over from scratch (which would be devastating for me at this point) ...
I'm about to place an order for a a bunch of model packs for FPSC 9 for Iron Infantry Fodder.... Once I heard they were compatible and the New "Dark Matter" kinda... I started looking closer.. I peresonally like their models. Especially the buildings, rocks, fences.. "eye candy widgets" LOL ... I think they are great.
...but I digress...
I'm glad TGC is making more options available in their fold. I think its cool.