Very little is new in the 1.4.1 version of Connect IQ, and when the version of CIQ on the watch changes, you likely will see no difference in the CIQ apps you have (you could have seen some as a user when it went from 1.2 to 1.3 if the apps themselves handled both). It allows developers to use new functions when they build or rebuild their apps.
In the case of 1.4.1, the only difference I've found (as a developer) is one function that was in 2.x and it was moved back to 1.4.1 It was a rarely needed function ( toStringWithBase() ).
I also develop watchfaces. I was curious to know if you know how to get the 1.4.1 SDK. I installed the latest 2.2.1, but I'm still only allowed to use 1.3.1???
The 2.2.1 SDK is the SDK for 1.4.1 (in the api doc you'll see the "Since 1.4.1" on the toNumberWithBase() call). As far as changing the minVersion from 1.3.x to 1.4.x, I'm not sure why you'd want to do that, as the change is just the one call, that you likely don't use. All it would do is block installing your watchface that have 1.3.x but not 1.4.x. Right now, that means people that haven't installed the new FW, and likely the APAC versions of the watches (the FW for those is often delayed from the non-APAC version), wouldn't be able to use your watchface. Also, devices like the va-hr haven't gotten FW with 1.4.1 at all.
Other than things that use something like FitContrutor, as a main part I can't think of any reason to change the minVerson. I just leave it at the default.
