Is there any idea of what the next offering at the company store will be and approximately when they'll be posted?
You ask good questions.
Looks like the CG FBM will be too long for you. The blade is 10" long.
My Heavy Heart FSH has an 8" blade (you've seen a picture above), but is just over 14" from tip to the end of the handle. I suspect when you say "tip to handle" you mean the length of the blade -- so the HH FSH will likely fit your spec ops sheath.
If you cannot find an FSH or HH FSH, look for the under-appreciated Hell Razor. The blade is 6.75" long (full length of blade, tip to handle) and it can do useful chopping. You should easily be able to 'score' one for under $400.00 on the secondary market -- it is a great blade.
The Ratweiler you mention may be
perfect for you. The blade is 7.5" long, the entire knife is just over 13" long. They were available new from the Swamprat Knife Company very recently for a price in the mid 200's. I have a few myself and I'm quite happy with them. The man to talk to about the Ratweiler is Eric Isaacson, the Super Bully. He's active on BladeForums and you can reach him very easily. He's a great guy to talk to and also another 'addicted' Knife Knut.
The next offering at the Busse Company Store (Idahoskunk's site) will probably be doublecut and/or satin FBMs ... and they'll be there any day now. I expect them to be relatively expensive and the blades will be too long for you (see my second paragraph).
The next offering at the Busse Combat Knife Works site (Jerry Busse's main site) will undoubtedly be the Anniversary Steel Heart 1 (ASH1). It will be available in both Combat Grade (cheaper coated blades) and a more expensive satin limited edition, most likely. We aren't sure of the prices, but we hope the CG versions will be in the mid 200 range. The knife blade will be 6.5" long and 1 7/8" wide at the widest point (INFI steel, naturally). The full length of the knife will be about 12". They could go 'up' at any time and will probably be available for ordering for quite awhile (months). Even if you get an order in on day one, you'll have to wait a few months before you see your knife -- but you won't be charged anything until around a week or two before your personal blade is finished and shipped to you. [I base the dimensional information on the custom ASH1s I have ... I've managed to score quite a few since Blade 07 in early June.]
Just keep asking questions ... we'll keep trying to answer.
Some pictures:
The third from the top is an ASH1 (orange/black handles).
This is a Hell Razor.
The bottom type is a doublecut version of an FBM. The two knives above it are doublecut versions of the FSH.
The lovely Ratweiler.
We finish with an obligatory picture of 'Grail Knives' -- knives we would all LOVE to have, but don't. These are original Straight Handled Battle Mistresses or SHBMs. Sadly, not mine. They belong to some HOG or other .... think his handle begins with a C.