I guess it's kind of like "a tree falling in the woods"...
If Sig reduces the price of something that's not available, have they really reduced the price??
As far as I know you still can't buy the conversion kits, or even the barrels. Sig isn't making them available until they have shipped all calibers as complete gun packages. Right now 9mm Compact and 40 Compact are available. 357 Sig compact is imminent. 45 ACP is on the horizon...
Once they get the ompact line complete, they'll need to work through the Sub-compact line and probably the full size line before they start releasing conversion kits. So at this pace you'll be able to convert a 9mm compact into a 40 sometime in 2025...